Obviously this needs to be tested, but it's not such a hard process, and you can do it all on 1 device, for example, buy a tablet, and constrain your entire UI in a 320x240 frame, see if it works, change size in the emulator.. etc.
There is a reason why Android Market and Apple appstore are so successful. They are dead easy to use, and do extend the programmers reach to a great portion of consumers, with little effort. If meego does the same, in one way or another, Kudos, and Great!