http://www.tesnexus.com/
The place for all your needs! ^^
It's been a while since I played Oblivion last, so I can't remember all the specific mods. There is a really nice hair mod out there, as well as eyes, I believe they are made by someone called Ren and have that nick as a sort of prefix for the mods =3 (so Ren's hairpack or Ren's eyepack, something like that). Loads of awesome hairstyles and eyes. I also think theres been some larger pack than include Ren's work along with many others, for more options.
Then there are 2-3 body mods that add more shapely males and females to the game, as well as some customizable body options, which I personally enjoy X3.
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One mod to get is the Better Cities of Cyrodiil mod (I seem to recall thats the name), that makes the exsisting cities more lively and bigger, without breaking any of the quests or locations critical for the base game itself (though it may break some downloadable mods, so be ware!)
There is also a really cool mod that makes the armors look much more awesome (more down-to-earth medieval stuff primarily), but I can't remember the name for this one. I'd recommend you just look around the nexus for a bit, see if you find something neat. Also plenty of anime-themed mods (armors, characters and weapons) out there if thats your kind of thing =3.
Enjoy the second most awesome RPG of all time! ^^ (personal opinion, may not be generally held as the second best RPG of all time)
EDIT: I see, well google some of the mods above and you may find them on other places, but really the only place to download Oblivion mods is the nexus I'm afraid =/.
