I finally saw an IPhone app that could make me consider switching to an IPhone. 

Are there any Nikon/Canon DSLR photographers out there that know of an app similar to this that runs on WinMo (Tilt2)?

http://www.ononesoftware.com/detail.php?prodLine_id=38

It has a client component that runs on the phone, and a server component that runs on your PC/laptop.  It allows you to control your (tethered-to-the-PC) camera from the phone over an ad-hoc WiFi link.

Photographer Dave Cross demos the app at 12:19 – 16:45 of Episode 37 of D-Town TV:  http://kelbytv.com/dtowntv/2010/04/08/episode-37/