my personal list
BSPlayer FREE, lets me watch youtube/listen to music while chatting or when mobile videos are disabled.
IM+, connects all my msgers including skype, clean interface, no very annoying video call button i accidentally hit constantly.. when I'm naked...
google drive, I like having access to my files
ASTRO File Manager or Root Explorer
Hubi - lets me stream shows from flash sites
Netflix - lets me stream shows from netflix
ISeeYou - keeps my phone on when I'm looking at it, locks rotation to the way im viewing.
Where's My Droid - I just like the options form it... probably not necessary with google and sony's tracking.
GrooveIP (for google voice calling over wifi, I dont have service at home)
Pandora - for when I dont feel like skipping every bad song.
Grooveshark - for my own playlists
so yea most of my stuff is media related... but I mostly use my phone for media or work, and the occasional surprise video call in the nude.