Ben Hall has written an interesting post on creating a testing framework with MEF. As Ben said it is more a learning exercise for MEF than a useful product but it certainly show show the ease you can add meta data and reflection like functionality to...
I have eventually got round to rebuilding my GUITester on Codeplex for VS2008. I must get round to looking to see if a similar declarative test markup system has any mileage for XAML. Something was talking about at Alt.net in the spring - how time flies...