Everyone's recommended the sites I would recommend. Ravelry is awesome! Sign up and wait for your invitation--they send out a lot in a day so even if the wait seems long, you'll be in within 10 days or so.

knitty.com which is an online free magazine is pretty awesome and you can access their past issues.

knittingpatterncentral.com is also a good site but Ravelry--ahh--love love love Ravelry.