This is a short list of the Star Wars Knights of the old Republic mods I used, followed by another section that I do't personally use, but are highly requested and/or suggested.
Restored Cut Content Mod - http://www.nexusmods.com/kotor/mods/54/
High Quality Stars and Nebulas - http://www.nexusmods.com/kotor/mods/41/
Fire and Ice HD - http://www.nexusmods.com/kotor2/mods/25/
Weapon Model Overhaul & Texture - http://www.nexusmods.com/kotor/mods/8/
High Res Skyboxes - http://www.nexusmods.com/kotor/mods/69/
High Res Beam Effects - http://www.nexusmods.com/kotor/mods/38/
Texture Pack Archive for KOTR 1 & 2 - http://www.moddb.com/members/xarwarrz/addons
OTHER MODS NOT COVERED
Requested:
Makes Carth Bisexual - http://www.nexusmods.com/kotor/mods/60/
Long Hair for Male Characters - http://www.nexusmods.com/kotor/mods/20/
Compatibility NOT Assured, could break stuff:
Jedi From the start (NOT Compatible with Cut Content): http://www.nexusmods.com/kotor/mods/1/
Keep this on your Watch List, it's not done yet:
KotOR Ultimate Mod - http://www.moddb.com/mods/kotor-ultimate