http://www.google.com/webmasters/igoogle/goforgood.html

http://www.google.com/webmasters/igoogle/images/gadget.jpg

(Saw it on Google Friends Newsletter)

Useful if you like walking! Cycling's my kind of thing :-)

I do 14 miles to college [and another 16 back] (Mon, Tue, Thur) Then ~30 on Sundays (at a much slower pace :-P)

Also mentioned at The Factory Tour:
http://blogoscoped.com/archive/2008-05-19-n87.html