Touiteur: Dumb Francophile name that you're bound to misspell looking for it in the market, but a really nice Twitter app for Android. Not quite as full-featured as Twidroid, but the interface might be the best yet on Android. Slickest move? The pulldown menu to tweet, which works just like Android's window shade for notifications. Free and pro versions.
Opera Mini 5 Beta: Remember all that Opera Mini hotness I showed you on the iPhone? Well, it's already on Android—if you tried version 4 and didn't think it was so hot, Mini 5's a totally different bag, and worth giving another spin. It's fast, smooth, and on the Droid or Nexus One, totally flies.