I'm on Ravelry!
Violet invited me to beta with her a month or so ago but I never signed up because their site said they weren't compatable with IE and I'm much too lazy to download a whole new internet browser :)
Anyways, I'd heard everyone talking about it so I had to go and check it out. It seems to be doing just fine with ie and it is so awesome.
You can list your current projects, your yarn stash, your needle inventory, your "wanna do" projects and soon your library of knitting goodies. There's also goodies for designers that I have yet to check out.
You can link to your blog, browse other people's projects, it appears that there's even a yarn trading area either up or in the works (I haven't looked too closely yet), link to pictures from Flickr, start -alongs. It's still in beta and I guess they have something like 3,000 people in the queue to send invites to (they are making sure they can handle that much traffic before they let them in... good idea!)
So come see me and definitely think about joining once it's 100% open. I plan on doing much photographing over the weekend to update all my projects and stuff. Yay for the internet!