PackageTracking is a pretty good app that lets you track your DHL, USPS, FedEx, and/or UPS packages in real time; right from your OS X desktop via Growl notifications.
There is one pretty glaring issue with the app: it's is currently pilfering its "box icon"
. On top of that pretty ugly little issue: I don't really like the way in which the icon is currently being used. So I created this replacement - made from a bunch of graphic bits you can snag on A2591