General Tutorials
The following sites offer a wide range of skills from which to choose:
http://www.khake.com/page67.html
http://members.tripod.com/MR_LEGO_JOE/free_tutorials.htm
http://www.free-ed.net/free-ed/
http://tutorials.freeskills.com/
http://www.freeonlineeducation.com/
http://www.user.shentel.net/rbowman/files/online.htm
http://www.geocities.com/talktovivek1/HomePage/Pages/tutorials.html