I saw this new UIAutomation wrapper appear in my feeds this morning, Bwoken
http://bendyworks.github.com/bwoken/
It also allows you to use coffeescript to write your UIAutomation tests, and seems to direct you down the page model path, although the page models are lower level and the steps read like code not natural language. I'm not sure it has any advantages over Zucchini but thought it would be of interest to people here as it's a similar tool.
- Stew