The Tweet Cloud app is pretty fun: here you can see my twitter cloud.
For me personally, it's interesting to see my vocabulary reflected - which words crop up the most often (feeling, paper, gorgeous) tell me interesting things. Paper especially, perhaps, what with the whole digital archive kick I'm on.
Earlier I did a scan without excluding @ words, which showed me that my most frequent replies are to boobolina, kplawver, and esinka. No big surprises there.
I was glad to see that while "crap" was noted, it wasn't in one of the stronger fonts. I feel like I've been using that word a lot lately. But cats and coffee trump it by a long shot.