Hello, Physics Forums. I've been working on a sort of open textbook website since the beginning of this year and am almost finished. I have certainly enjoyed building it, but it has come to the point where I would like to hear a little bit about what other people think. So, as science-minded people, what do you think of my site? I would greatly appreciate some constructive criticism, suggestions, etc. Useful? Not useful? Redundant? Preamble: Through the course of my undergraduate career, I became somewhat annoyed at the high textbook costs. This could often be circumvented by buying old editions but attempts were often thwarted by rearranged homework problems and Mastering Chemistry. I admire open source projects quite a bit and, thus, decided to begin my own project revolving around public content creation. Concept: Users create pages marked up by XML. Pages are given a category (e.g. Physics), subcategory (Electromagnetism), and topic (Electrostatics) and can be rated by other users. Site revolves around revenue sharing. Authors can choose to input their AdSense ID so that they will receive revenue from the 1-2 ads displayed on their pages. Authors can also input their Flattr ID to receive donations or turn off ads entirely on their pages. Pages can be compiled into books organized into chapters. Only authors can edit pages, but any public pages can be compiled into a book. Once everything is working and functional, I'd like to add lots of textbook-esque features (text highlighting, a glossary, etc.). Authors retain all copyrights to their work. So what do you think? Something you might use? If not, something you could see other people using? Posted in the wrong forum or in violation of ToC?