Have Linux questions?:
http://www.linuxquestions.org/

Need Documentation:
The Linux Documentation Project


Looking for the latest distribution?:
http://distrowatch.com/

Beginners, intermediate, and advance tutorials:
http://www.linux.org/
http://www.linuxtopia.org/
http://www.howtoforge.com/

Need application's source code?:
http://sourceforge.net/

LINUX BLOGS, FORUMS, and some DISTRO SITES:
Your Own Linux
http://www.kubuntu.org/
http://linuxmint.com/
OpenSUSE
Linux Forums
Unix and Linux Forums

Hardware Compatibility:
http://linuxhardware.net/linuxhardware/notes/

For Programmers and/or experts:
Kernel Archives
Cool tcpdump tutorial

Other Sites:
http://www.seamonkey-project.org/
http://www.mozilla.org/
http://www.graphics-muse.org
http://www.linuxfoundation.org