As of right now, the Gamers Helping Haiti Bundle has raised over $100,000 to assist Doctors Without Borders' Haiti relief efforts. Read that again: $100,000.
For a measly $20 you get 180 PDFs from publishers large and small who are putting up their own hard work for free to help people they've probably never met in a land they've probably never been to.
The value of this bundle is amazing, as it contains many products that are already more than $20 on their own. Further, with 180 PDFs in the bundle, there's something for everyone.
If you have $20 to spare, log in and grab this bundle.