The fourth site I've done with Mach-II just went live. It's the revamp of the Girl Tech web site, and it will be managed both through a Mach II based interface as well as Macromedia Contribute. My skills with Mach-II get better with every project, and the more I use the framework, the more impressed I am with it. My next project is a multi-lingual site that will use Mach-II, so that should put a new wrinkle in things. I'll post any lessons learned/gotchas here!