X-link to the DRM-free thread for two new bundles:
Humble Book Bundle Hacking presented by No Starch Press, full of computer/internet-related books mainly focusing on security and malware-protection issues, but also a few DIY programming guides.
The Boss Fight Bundle from StoryBundle, containing mostly guides to assorted video games with substantial making/history-of with interviews with the game developers, and some other essays and fiction in the game settings as well.