In the Beginning was the Command Line: A history of operating systems, by Neal Stephenson, the author of such novels as 'Snow Crash', 'The Diamond Age' and 'Zodiac'

Open Source Software Licensing Page: Some very interesting articles on free software licensing: history, forms, and problems, seen from a commercial view. Links to some license texts and important open source sites

Slashdot: News for Nerds. Stuff that Matters

SourceForge: Resources for open-source developers and a directory of in-development open-source software

The Free Software Directory: A catalog of free software collected by FSF staff and volunteers. Can be queried or browsed

Why Open Source Software / Free Software (OSS/FS)? Look at the Numbers!: In-depth review and analysis of the many quantitative reasons to use open source software, with statistics from a variety of recent surveys

Wikipedia: A free encyclopedia built collaboratively using wiki software. (Creative Commons Attribution-ShareAlike License)