X-link to the DRM-free thread for a new Humble Bundle:
Humble Book Bundle Hacking Reloaded presented by No Starch Press contains DIY books mostly on the subject of hacking (both how-to and how-to prevent security breaches), and mostly for dedicated computer programming/network stuff, but also a title for modifying your car at the $1 level, if you're interested.
Last week's
Humble Book Bundle Treat Yourself presented by Callisto Media with self-care cookbooks, fitness/sex advice manuals, and New Age-y wellness guides is still available.