Right now I'm using a Q9C with WM 6.1. I am going to be getting my Storm very soon. Why can you not run your apps from the card like WM? Is it just for storage of photos and the like?
mainly, the media card is for storage. Check out THIS thread for more info. There are apps (Aerize Card Loader) that will allow you load and unload apps.
I too am a WM convert and this is one of the things I miss (close to the only thing)