An excellent list from linuxpoison:
List of best Linux blogs - V2
Posted by Nikesh Jauhari
LinuxHelp Good site with great stuff, frequently updated.
HowToGeek Great How to site, not only for Linux but its Linux section is great!.
LinuxScrew good site which is coming real popular these days, with great articles.
Fsckin Frequently updated Linux site, great tutorials, and good posts about games for Linux.
Ubuntu Geek All about Ubuntu, from a real Geek
BashCuresCancer Site devoted to command Line, unfortunately not too frequently updated
http://www.linux-gamers.net/ For Linux games, how tos, forums, etc. about Video
Ars Technica Open Ended section: http://arstechnica.com/journals/linux.ars
Phoronix: http://www.phoronix.com/ (lots of good Linux stories)
http://www.markshuttleworth.com mark shuttleworth's blog
http://ubuntuliving.blogspot.com ubuntu living
http://planet.gnome.org planet gnome [same as planet kde]
http://planetkde.org planet kde
....more links and excellent posts at linuxpoison.