I'm not a big fan of status bars...
...I find them tricky to interact with programatically, and no one ever looks at them anyway, but this morning, this quote from Chris Sells' Windows Forms Programming in C# really ticked me:
Pg 106: “According to legent, Microsoft did a usability study [of the status bar] awareing people $50 if they would look under their chair, putting the notification for this award in the status bar. The $50 went unclaimed during the testing.”