2nd to 1st Person - changes the popup dialog to reflect a more 1st person, role-playing atmosphere.

Alive Waters - adds plants, fish, and shipwrecks to Oblivion's underwater

Ambient Town Sounds - adds ambient sounds to the towns and cities, making them feel more alive

Arrow Replacement Pack - arrows that are now appropriate in length for a Medieval era

Babarized - OOO Armors - alters OOO armor so that it will fit the BAB body

BAB Better Greaves - fixes the leather greaves armor for BABs

BAB BIU Adventuress Body - complete female body replacement mod - with clothing and armor

Bag of Alchemy - among other things, helps you to quickly find ingredients with the same effect.

Bananasplit Better Cities - makes the small, empty-feeling cities feel much more alive - and larger. 

Bank of Cyrodiil - now you can keep your valuables in a safe place - and your gold earns interest

Bathing Mod - this cool mod adds the ability to take a bath in the game - along with copper bathtubs

Bors Bedrolls Fixed - allows you to pick up existing bedrolls, and buy bedrolls from merchants

Book Jackets Oblivion - greatly improves the appearance of the exteriors of all books

Brighter Drop Lit Torches With Weight - torches now weigh 1 pound, but are brighter, and droppable

ChaseCamera Mod - just fixes some minor chase camera issues

Choices and Consequences - adds some non-linear quests, skill requirements, faction reputation, changes some journal entries

Cities Alive at Night - no more dark and dead looking cities when you approach them.

Common Oblivion - adds lots of little things through a shared library - allows different mods to "talk" to each other.

Corean Hair for Original Race - 26 new hairstyles to select from - for original races

Cyrodiil Transportation Network - adds back Morrowind style travel to Oblivion

Darker Dungeons - makes dungeons so dark that torches are actually needed to light your way

DarkUId DarN - greatly improves the stock Oblivion user interface, menus, and maps

Days & Months - adds Earth's names for the months and days of the week after Tamriel's

Diverse Grasses -  adds to and changes all the grass in the game - also optional LOD textures

Duke Patrick's Magic You Can Believe In - more realistic (and very cool) magic effects

Duke Patricks SCA Combat Archery - major realism and balance overhaul for combat archery

Duke Patrick's SCA Style Combat - changes the Melee fighting to feel more realistic

Elf Female Younger Voice Replacement - changes sound files to a younger female voice

Elven Map For Shivering Isles - change the Shivering Isles map to an Elven Map Redux look

Elven Map Redux - changes default brown map to a full color "elven" map, more detailed icons.

Enhanced Quest Roleplaying - adds dialog choices & consequences, along with some quest changes

Enhanced Water - greatly improves the appearance of the water - both above and below the surface

Enhanced Weather - a photorealistic weather mod, with a fully seasonable weather script, and SI support

Ethereal Eyes Universal Edition - adds custom eye - where my Wood Elf's blue eyes came from

Facial Textures by Enayla - replaces all the human, elven & orc head textures with new base textures.

FF Real Thirst - your character now needs to drink water. - being thirsty results in loss of stats

Get Wet Update -  your character and NPCs/creatures now appear wet from rain - and from swimming.

Harvest [Flora] - graphically shows when you've harvested a plant

Illumination Within Revived - timed lighting for windows of shops, homes & other buildings

Initial Glow - magical glow effect of spells and enchantments will just flash briefly, and then disappear.

Kafei's Better Amulet and Better Ring Replacers - much better looking jewelry

Let The People Drink - adds fountains and a Great Aqueduct from Charcoal Cave to the Imperial City

Living Economy - adds more realism and diversity to the mercantile environment

LOD Replacement - replaces the blurry mush of distant textures

Louder Nirnroots - turns up the volume of the Nirnroot sound

Menu Escape - adds right mouse button (and/or space bar) functionality to menu navigation

Menu Time- makes game time pass while you are are trading, reading a book, lock picking, etc.

More Immersive Sound - tweaks the ambient sounds to improve immersion and the nature feeling

Musical Immersion - Tweaks the music to be more in sync with your game - enhances the immersion

Natural Faces - adds 512x512 resolution base face textures (up from 128x128)

No More Annoying Messages - no more big "Loading Area" messages.

Oblivion Mod Manager - This makes installing and uninstalling mods much easier. use this!

Oblivion Script Extender - any mod that has [requires OBSE] needs to have this installed.

Oblivion Sound Sets - gives your character ability to speak - and also gives him or her a personality

Oblivion XP Levelling - Alternative leveling system where Experience Points (XP) are used to advance

Oscars Nicer Grass - alternate grass mod: lower grass length and density, with much better FPS.

Oscuro's Oblivion Overhaul - a complete makeover of Oblivion

P1D Key Chain - This mod adds a key chain to your inventory, which contains all your keys.

Persuasion Overhaul - replaces that horrid mini game with more immersive persuasion

Proximity Based Sneak Penalties - factors in visible light and proximity penalties to your sneak skill

Quals Harvest - adds apple and orange trees (with edible fruit), harvestable logs and more

Quest Popup Remover - Prevents messages from appearing - now you can use your brain.

Race Balancing Project - an overhaul of all races, birthsigns and the whole Magicka system

Rainbows in Tamriel - adds rainbows to the game's weather system.

Real Hunger, Cobl - your character now needs to eat food - being hungry results in loss of stats

Real Lights - removes most of the fake lights and rebalances the interior lightning system

Real Sleep - your character now needs to sleep - being over-tired results in loss of stats

Realistic Fatigue - your character now gets tired from running, jumping, fast swimming, and combat

Realistic Physics & Force – killing no longer causes enemies to fly upward or through the air

Remove the Invisible Border Wall - how to get rid of the invisible wall along Cyrodiil's border

Reneer's Gold Mod - allows you to drop gold coin and place in containers - also adds weight to coins

Reneer's Guard Overhaul - changes how guards react to player crimes and gives you more options

Roleplaying Dialogues - makes the boring conversation between NPCs and player more interesting

Salmo the Baker - Salmo the Baker in Skingrad now sell his bread and rolls

[Duke Patrick's] SCA Combat Archery Compatibility Patches - for use with OOO, C&C, MMM, RBP and other mods

See You Sleep - now you can watch your character actually climb into bed, lie down, and fall asleep

Silk Dragon Imports for BAB - adds a dress shop in the Imperial City Market District for BABs

Simbacca's Player Advancement Method - changes how the level-up attribute modifiers are determined

Stealth Overhaul - makes sneaking around more interesting and rewarding

Storms & Sounds - adds thunder & lightning and you now hear the weather sounds when inside

Symphony of Violence - This mod makes combat sound much more realistic.

Tamriel Travelers - adds Traveling Traders and Traveling Merchants all over Cyrodiil

The Lost Spires - uncover the mysteries of ancient Tamriel by joining the Archeology Guild.

Timekeeper Advanced - displays game time (configured interval or key press) - plus much much more.

TNR All Races Final - an NPC total conversion mod - greatly enhances the appearance of 1,237 NPCs

Unofficial Oblivion Patch - fixes over 1600 bugs in the game, including many quest bugs.

Unofficial Official MODs Patch -  fixes the bugs in the official mods that were released by Bethesda

Unofficial Shivering Isles Patch - fixes over 270 bugs in the Shivering Isles expansion

Wrye Bash - a mod/save game management utility and so much more - a tool that "bashes" your OB mods