Once I figured out where/how to save the cartridge, it seems to be working on my Samsung Moment Droid phone. I had to connect my phone to the laptop and save to the app's folder - it didn't work downloading from the web on the phone since it didn't save to the right place (app's folder), just the generic download folder. If anyone has a hint on how to specialize the downloading location, please let me know! The app I'm using is called WhereYouGo. I also run GeoBeagle, which I especially like for the maps. I'm going to try for one or both of the Wherigo caches close to San Diego this weekend...
That was what I was missing....once I got the cartridge in the right folder it worked just find on my Motorola Android. Thanks!!