Ben Hammersley has information on how to track your FedEx packages through RSS. Essentially you just put your tracking number at the end of this URL:
Then subscribe to the URL as a RSS feed to track your package. Hammersley also provides a copy of the source code for those of you do-it-yourselfers.
How long before UPS/FedEx/DHL start providing this as a standard service? Do the shipping companies even know what RSS is?
What I love about this is that the shipping status information is being pushed to me; I don't have to go to the site, paste in the number, and drill down to the status.