ERIN_KIM  This app is dead-simple but has some nice flourishes. My favorite feature is the news links. When an interesting price floats across the menu bar, I can click and get a list of news articles to try to figure out what is causing the price movement.

Version 7 did crash on me a few times but Version 8 seems very stable.  
(Version 8)

ERIN_KIM  Love it, especially the animation when switching from timeline to mentions to messages to searches. Tweetie kind of has the feel of an iPhone application; perhaps, in fact, too much so.

But basically it is very polished, an awesome app.  
(Version 1.2.1)