I don't know about anyone else but many times when I want to check on the status of a parcel that is being shipped with a tracking number it can be a minefield to find out which site to go to as many of those numbers don't work on UK based sites etc.

This site solves the problems as it is a universal package tracking site:

http://www.packagetrackr.com/

I tried it for a few packages I am waiting on from Hong Kong, Japan and USA and it worked great.
Also shows you a nice little map of the journey to your home!

Just paste any tracking number in and click Track It and you are good to go!