I got my Ravelry invite.
Oh my god. This site is amazing. Better than I imagined and than I could communicate to you now. If you knit or crochet and you haven't signed up for an invite yet, DO IT.
You can list your yarns, projects, patterns and books, then see what other people are doing with all of them. Bought one skein too many for a project and unable to return it? Problem solved! Just look up the yarn and you can see what others have done with it. Want to substitute the yarn for a particular project? You can see what other people are using at the click of a button!
There are groups too, based around a wide range of topics, from feminism to goth, and Joss Whedon to Brenda Dayne. Anyone can start one up and my immediate favourite is lolravelers - devoted to cat macros with yarn and knitting in them.