Knitty.com
We love this site for funky, up-to-date patterns, tips and techniques.  Very unusual, fun designs for all.

straw.com
This is filled with free patterns for almost anything you want to knit. 

berroco.com
Again, free internet patterns by style or yarn type.

VogueKnitting.com
The online version of Vogue Knitting magazine.

KnittingHelp.com
This is a knitter's best friend for help from the basics to advanced techniques.  This is by far our favorite website for information.  There are videos for both continental and American style knitters as well as detailed information from casting on to to any technique you might want to learn.  Go visit....you'll be amazed.