Now I'm sure David Letterman knows all about Twitter, but he played dumb on the show a couple nights back when he had Kevin Spacey on a guest. Kevin busted out his BlackBerry Bold and educated David in the ways of Twitter. It's funny clip, be sure to watch. And if you're wondering what Twitter client Keyser Söze himself is using, by his description from sending a tweet it sounds like TwitterBerry.

Ongoing Twitter Contest: We just gave out another free app this morning in our Ongoing Twitter Contest. All you need to do for your chance to win is follow @crackberrykevin on twitter. It doesn't get much easier than that - I want to give a lucky follower a new BlackBerry Tour (or other device of choice) soon, so be sure to follow and spread the word.

Related Twitter Links: Twitter Roundup 1 | Twitter Roundup 2 | New - TweetCaster