You could try ORKUT. Ask someone to invite you because you can’t join without someone already on Orkut inviting you. Two communities that I have started there concern the Design Firm IDEO and the other community is on Innovation. Lots of discussions going on there.
Also if you want to connect/network with professionals on the area of Innovation, you could try LinkedIn. Its a fantastic service and most people will link with you if you give them a good enough reason.
Thinksmart or the Innovation Network is great for articles on Innovation. Joyce Wycoff is the best! You will find posts from past conferences on the blog there and lots of book reviews too. Its a great resource.