I'm really happy about the new FastCompany website. The clean design is aesthetically pleasing, and really invites people to join in. Hey, it got me to sign up!
I like the concept of being "where ideas and people meet." There really isn't a place on the web to go if you just want to discuss business and throw around ideas. Not any good place, at least. That said, I'm not sure it's such a great idea to include the LinkedIn-esque features as well, because it just confuses the concept a little bit.
I'm still exploring the new site, so we'll see how it goes!