Mine in order of use is:
I drive a lot for work to new locations from home or location to location, without this I'd be lost!
I know next to nothing about music and the people behind it so I've been using this to tag music while driving so I can later look up the artist and listen to more of what they got to better learn who made that song.
OK So I've been a bit lazy to look up a better App for the purpose I use this one, but from waking up to remembering to do tasks like send in email reports I use the Alarms and their descriptions quite a bit.
Yet another work related item, I'm almost always early to locations so I'll sit back in my truck and read up on whatever interests me. Lately I have bookmarked "List of Theoretical Physicists" and have been reading their wiki entries from the first one down.
Because it's my home screen it's technically my most used program. I do like it too as it gives me up front information from my Email, Texting, and Google Reader news not to forget missed Calls. Google Reader keeps me busy enough so I got the other services turned off.
Other programs I tend to use are Opera Mini 5, eBuddy, TasKiller, FBReader(just got it and love it, may even take time away from WikiMobile), AndChat(not a big chatty guy though), and GoogleSky(gotta have it for those star gazing nights).
I guess I almost forgot to mention I use Cyanogen, I was JUST about to give up on it because it could and usually did take over a minute to wait on a program to load or EVEN MAKE A CALL but the latest update seemed to fix all my frustrating and nearly destructive woes.
Oh and FIRST POST in new forum area!