With such intense competition for attention on the web, it has become essential to learn how to market your project, even if you aren't selling anything. Web Marketing Today (wilsonweb.com) offers a huge free database of literature on web marketing concepts and techniques, from search engine optimization to social networks. The articles are extremely informative and useful, and span at least a decade. One highlight is Dr Ralph Wilson's The Web Marketing Checklist: 32 Ways to Promote Your Website. Started in 1997, and updated recently, this checklist provides a wealth of practical web marketing tips and a solid foundation to work from.