Some of the Linux sites that I visit rather regularly:

• Groupe romand des Utilisateurs de Linux et de Logiciels Libres A group of French-speaking users of free software (which includes Linux)
• Linux Today A site with regularly updated Linux links, a bit commercial though, and has recently started accepting money from Microsoft in return for advertising
• Distrowatch A site which has a good overview over Linux distros
• Redhat Although gone a bit commercial in the last few years (note, you can still get the source for their products), they still have their head screwed right on and caused a big push for Linux on the servers. Their 'Enterprise Workstation' release lags a bit behind, though, when looking at all the nice new software that is coming out.
• The K Desktop Environment A (possibly 'the') premier desktop environment on Linux (and a few OSes with Linux 'affinity), with lots nice eyecandy, useful applications, and even a slew of good games
• Mandrakesoft Mandrakesoft, publisher of MandrakeLinux
• Penguin Liberation Front The Penguin Liberation Front publishes RPMs for Mandrake which have a somewhat questionable legal status, like dvdcss et al. Also, their latest distro fields KDE, which has some advantages
• LXer Linux News Another Linux site, definitely less Microsoft oriented.
• NewsForge THE opensource news site (no, BSD is not dead....)
• Unixboard.de A Unix discussion forum where people help each other sometimes
• KernelTrap a Nice website that caters to the folks that always want latest kernel