Oscuro's Oblivion Overhaul (OOO):
This is a huge mod that adds a bunch of new content, redoes leveled lists, and generally makes your experience much more interesting, and much more difficult!
Unofficial Oblivion Patch:
Fixes a bunch of bugs leftover in the official release. Recommended.
Ren's Beauty Pack:
Look at my pretty hair! Look at it!
An Imperial Beauty (character face/save):
Now you, too, can have a character with a face that looks human!
More updates to come soon as we get to them in the series. ;)