We know a ton of Mac users who use Tweetie for Mac as their desktop client of choice. However, since Twitter acquired Tweetie, they've kind of put the desktop client on the back burner. It still works and all, but newer features like lists and retweet are sorely missed. However, thanks to developer Nick Paulson, there's now a free SIMBL plugin that forces Tweetie to use Twitter's native retweeting functionality. We highly recommend it for all Tweetie users out there.
Read More | ReTweetie