Hey, DonorsChoose.org is a great example of how we all use the Net to help each other out, by pooling a few dollars to give people a break. It's like microfinance applied to classroom projects; we all can contribute a little to fund a classroom projects.
Newsman Stephen Colbert has a great project here, Support Our Troops' Children, which the focus is on classroom projects where serve the children of service members.
Here's a podcast where he talks about it.
This couldn't be any cooler, please check it out!
… and in no particular order …