I would like to see support for multiple units, I would like to switch between my unit at home and the one in the car easily.

I too would also like a Pocket PC version. The PPC embedded VB environment is free from Microsoft and my guess is that it shouldn't take a lot of converting. I was planning to have a go at this type of app for the PPC as soon as I get my iPAQ which is hopefully later this week. But as yours is nearly perfect and a lot more flexible than I would have written (with skins etc),it seems silly.