Today is the last day for TC50, there appears to be some good companies that will be demoing.
I just signed up for the beta of WebVanta.com it's a new CMS for web designers and sit builders. It sounds really cool. Apparently some of the guys who used to work at Adobe are building it. I believe they will be at TC50. One of the sites built with it, BuildingWebApps.com
Check out Webvanta.com