Genius bit of software

Grabup makes it ridiculously easy to share screen shots. You install it, then when you do a screen grab in the normal Mac way (shift-apple-4 then select a region) it instantly uploads it to a web server, and puts the url in the cut-paste buffer. Like this:

http://www.grabup.com/uploads/7b4c309435703ee3cfb6a5a0e506ab71.png