I suppose I shouldn't assume everyone already knows about the marvelous Knitter's Review in which ...

Clara reviews ::

• yarn... all sorts, arranged by fiber
• tools... needles, software
• shops...online and off
• books
• events... arranged by month
• and "the best of the best" online resources (look under links)

... and you can sign up for the free weekly email newsletter, vote in the polls (most recent : What's your sign?), and enter the forums.

And last, but certainly not least, check out the marvelous "how to" and "fiber facts" sections at the bottom of the Yarn reviews.