Best Mac Twitter app: Over the last several weeks I've been looking for the best Mac Twitter app I can find (along with the best Mac Facebook app I can find), and I have to say, I'm pretty much sold on the combination of Mac, the RockMelt browser, and Growl (a Mac notification app). Not only is this a good Mac Twitter app, it's also a good Mac Facebook app, and, well, a good general Mac social app approach.
Mac OS X Question: Is there a notification program for Mac OS X, like the notification balloons that appear on the task bar in Windows?
As of Mac OS X 10.5.7 there is nothing built into Mac OS X to provide this functionality, but there is a great, free application named Growl which provides similar functionality.
There are several cool things about Growl. First, it works with a number of Mac applications, including but not limited to Firefox, Easy Batch Photo, Komodo Edit, and NetNewsWire.