crnka

I'm using it. I have a habit of posting list of links in my blog so this tool really helped me get things done faster :)

I remember this site from a Netted email. Looks promising but I believe it will be hard to convince people to switch from Delicious. Good luck though..

I think Disqus is a good choice for the comment system. There are some issues with the frames when I try to login to my disqus but other than it looks nice and I think can be used easily to collaborate.