Do It Tomorrow : I use this for grocery lists, addresses, therapy notes, anything I need to remember really.
AlarmDroid: Pretty self explanatory, works really well. It does however reset AM/PM every time you reset the alarm, so keep that in mind. Almost burnt cookies from that before. >.>
Steam: Again, self explanatory. But it's nice to have, imo. Works as the friends list on your comp.
Reddit Mobile: Kills lots of time when waiting.
Androdify: I like it, not sure how many of you will. You can make and save littler personalized droids. I think it's cute.
The Whip: If any of you watch Big Bang Theory, you know why it's awesome.
JustWink: Make little e-greeting cards on your phone. Some you can even add a picture to. And you're able to sign your name with your touch screen as well.

Wi-Fi Finder: Sometimes my wi-fi drops randomly, and sometimes I don't want to use my network.. It detects wi-fi in your area, red are password protected and green are open.
I have a ton of camera/picture editors and games as well.
I'll list them later if anyone's interested.