Hi,
In IIS 7 you can easily use extensionless urls and have somesite.com/cars instead of cars.aspx
Make sure your app pool is configured as Integrated not Classic.
Long term yes I would like to move to MVC but its going to take a while and until I reach profitability I'm not really free to work on that as much as I would like. MVC 2 looks much better than MVC 1 so its not a big hurry, it may be better to wait and let it mature a little more.
Really what needs to happen first is I need to implement the Repository pattern and re-factor our business objects moving much of the code that talks to the data layer out of the Business objects and into Repository business objects so that we can more easily use Dependency injection by passing in Repository objects. Then efforts on the MVC side could progress somewhat independently of the WebForms side of things and using the same business objects and repositories.
There is a roadmap page but it mainly covers near term plans. I'm working my ay through the things on that list and will have to update it at some point soon since many of the planned thigns are now completed.
Best,
Joe