Is it OK to post my own site? If no I can understand if a moderator removes it but I'll try:
Linux Switch Project [I've removed site and moved it to http://cgi.bytebin.net/
in the Linux section.]
I'm trying to fill it out with articles on how to do stuff with Linux. I have a lot of notes on what I want to add. Just have to find time to add it.
Also some other favorites, besides the Linux Mint site is:
Metalx1000 has some really cool linux programming and other tutorials, including using LMMS, Ardour, etc. Tutor4u has a lot of cool Inkscape, Gimp and Blender tutorials.
Those are some of my favorites.