FreeOS - Provides articles, documentation, links to software, and news about Linux and other operating systems.
The Linux Counter - Get yourself and your computer counted among the Linux users.
Linux International - Non-profit association of groups, corporations, and others that work toward promoting and helping direct the growth of the Linux operating system and community.
"Linux was invented here" - University of Helsinki - Department of Computer Science. Information about Linux and get the latest kernel versions and recent Linux kernel mailing list archives.
Linux.com - A portal from SourceForge offering news, articles, and a "how to" knowledgebase.
What Is...Linux? - Definition of Linux and description of its history, relation to GNU and other UNIX systems, and links to related sites.