For those of you Twitterers who use Tweetie on iPhone, you know that atebits makes a solid product. We've been beta testing their Tweetie Mac desktop client for a week and we can confirm that it is a simple, solid product. It does what it is supposed to do then gets out of the way. We've been using Twitteriffic until now which has some other great features but are inclined to make the switch to Tweetie.
Tweetie for Mac Desktop is available now for $15 but they offer a free, ad supported version that is almost as nice. Download here.