There's nothing like a little peer pressure when you need someone to do something. Combine it with instant gratification and total transparency and you have the fundraising triumvirate!

Google Checkout has a great little campaign going on in honor of Earth Day that gives you all three:

• You make a donation to an enviro org on someone's behalf.
• That certain someone gets an email and asks them to do the same.
• As the donations tally up, you get a personalized map showing all the people you inspired to donate, illustrating your network effect.

So, who wants to see if their friends are more generous then my friends?