A great article on how important it is to have more than just “any old web site”, courtesy of A List Apart.
http://www.alistapart.com/articles/humantohuman

Cool online community all about setting goals, sharing them with the world, and inspiring one another to achieve them.
http://www.43things.com/

Write a letter to the future you. Pretty neat idea.
http://www.futureme.org/

A cool way to make a project more challenging.
http://hidethisthing.com/