X-link to the Non-Fiction megathread, where the copy-paste of the current full contents went:
The new Humble Bundle for ebooks from No Starch Press contains at least 3 graphic novel guides to stuff, including The Manga Guide to Electricity, TMG to Physics, and a Comic Guide to building your own website with HTML, CSS, and WordPress.
I own paper copies of the Manga Guides, which are excellent and translations of works written by Japanese university professors.