Some other's I've grown to love:
Meebo IM: Manage all your IMs in one location. I've become so self-important b/c of this app, lol.
OI Shopping List: Really convenient, and it's a reason to constantly pull out my phone in Wal-mart.
PS3 Friends: Can always see which of my friends are online if I'm away from my PS3. It'd be cooler if you could send and receive messages, but Sony doesn't allow it, as they have a phone that does that. There's also an XBox one, but I don't have a need for that.
Dizzler: A music streaming app that you just search for the song you want and it'll play it. They're working on being able to make a playlist from your PC and accessing it on your Droid.
Beer Counter: I've been needing this for years. Use it to anticipate your bar bill and see how much you really drank. Not to mention see if bartenders are padding your bill. Remembering to use it after beer #6, well, best of luck.
Droid Scan Beta: My g/f bought a fancy new printer that puts out photo quality prints. Also copies. Doesn't scan. Guess what? Droid does.