Blogger Action Day -- DonorsChoose.org
I had a great experience donating to DonorsChoose.org when they had their Stephen Colbert Democralypse.
I gave to:
Biology Dissection is Fun
$166.67 contributed on March 22, 2008
I got back a ton of photos of the students cutting up the rats and a bunch of really nice letters. Of course Obama won the challenge beating Hillary 160k to 30k.
They are the best online charity I've used. Try it for yourself!