General knitting links (alphabetically):
The ABCs of Knitting -- basic knitting techniques (Japanese site)
The Daily Knitter is an online resource for Knitters
FaeryCrafty's links to scarf and shawl knitting patterns
Glampyre has some neat how-to stuff on her site (stitch counters, making your own needles, a free top-down raglan cardi pattern, etc.)
Keyboard Biologist's Techknit section
Short Rows Tutorial at ArtYarns.com
Knitting-and.com 
KnittingHelp.com -- GREAT site for knitting techniques (has videos)
Knitting Fiend -- free custom-generated knitting patterns and calculators for various things like increasing and decreasing
www.knitty.com -- Knitty is an online knitting magazine
The Sock Calculator  
Wiseneedle -- yarn reviews, patterns, advice and more
Some handy charts at Yarn2Fiber.com