Tinyurl

Tinyurl transforms those way-to-long-to-type urls into the format tinyurl.com/xxxxxx.

http://www.ddavid.dk/2006/11/opus-life-is-life.html becomes http://tinyurl.com/y5h3om.

E.g. this could be useful if you put urls in your MSN name, as these aren't clickable. You get the idea.