Give $20 at RPG Drive on donations to Doctors without Boarders, get $1400+ in PDF products. This actually is a great concept for the companies that are donating their products to get them in the hands of those that might otherwise pass on them due to an unknown name/pdf prejudice/etc.
It looks like the RPG download is being overun with folks and clogged up their intertubes for downloads, so if you do go, you may have to wait a day or two to start downloading all the goodies.
I glanced through the list, a few gems in the mix, a few duds, but I will most likely support and see what they all look like.
$20 is cheap in the long run