Track this is a web-based package tracking application.
It can pretty much everything from FedEx and the usual to CEVA and Canada Post.
Register and it can send you updates through the website, email, SMS, RSS, Twitter, or Facebook. Pretty much, you can stalk your package.

It’s pretty nifty, especially when you get a few packages and its hard to keep track. I used this recently for a set of 4 different boxes, and it was pretty nifty.
Check it out: TrackThis