I agree that Quilting Arts is a wonderful source of information.
Quilt University has a lots of non-traditional classes and adds more each semester.
http://www.quiltuniversity.com/catalog.htm
The websites and blogs of many of the fiber and mixed-media artists have loads of tips, tricks, techniques and tutorials as well. Check the SAQA website for artists names and links to many of their sites.
http://www.saqa.com/index.php
There is also a great deal of information at the QuiltArt site (and even more if you subscribe to the mail list).
http://www.quiltart.com/