Life Stories - I was a big fan of the FMyLife app, but Life Stories has FMyLife, FMySexLife, Gives Me Hope, Hate Post, It Made My Day, I Had a Win, My Life is Average, Makes Me Think, My Life is Crap, and Today I LOL'd. Great way to entertain me while I'm bored.
Twidroid Pro - I wayyyy overused the free version, so it was only right to pay for it.
NewsRob - Great way to get my Google Reader content.
I know that's three, but they are the three that keep my day entertaining.