I have a Snowglobe app that was just approved for sale in the Samsung app store.
It uses the accelerometer in the Samsung Omnia, and it should also work with the accelerometer in HTC devices. I am looking for a few HTC owners willing to try it and tell me if it does work (or not). For devices without an accelerometer, you can also simply tap the screen to "shake" the globe.
There is a demo version in the first post here. The demo has a single globe background. The registered version has over 30 built-in backgrounds, as well as the ability to use an image of your own or to snap a photo to use as a background.
Please try it and post your results. Note that you tap and hold to bring up the options menu and exit the program.
Brass Key Software