I came across Plug & Play Tech Center in Sunnyvale (plugandplaytechcenter.com). It seems they have a lot of Internet startups working there. Have you worked there, or in any other incubator? Was it worth it?
Incubators can be good or bad depending on which one you choose and which stage you're at. There is no easy way to answer this. Although it'd be interesting to hear what others have experienced.