I've had to stop watching the coverage because of the sheer scale of it. It seems very daunting for someone so far away to do something to help.
DrivethruRPG/RPGnow has set up links for $5 and $10 donations, but the $20 donation bundle offer is just incredible. Partnering with many of the small-press publishers that sell through the site, DTRPG is offering $1,400 in PDF ebooks with a $20 donation. They email a coupon code that allows a customer to then load all of the listed items into a shopping cart for free.
The titles in this free offer are not the dregs of the site, by any means: BASH! Basic Action Super Heroes, Copper Dragon: Basic Dungeons 1, Castlemourn Campaign Setting, Chronica Feudalis, Dragonshire: City Interiors and City Ruins, Damnation Decade, Hollow Earth Expedition Earth Drill, Kobold Quarterly 11, Mars: Savage Worlds Edition, Roma Imperious, Squirrel Attack! Operation: Get Mr. Jones’ Nuts, Thrilling Tales (2nd ed., Savage Worlds), 3:16, Trail of Cthulhu Player’s Guide, Serenity, several items from WorldWorksGames... absolutely incredible. The donations go to Doctors Without Borders. Thanks to Blink for pointing this out today.