Great job, nice to see people with the ipaperweight can geocache too!
Its great to make it available to that many more pep. that wont go out and actually buy a gps unit. Or a real ppc.
GPS battery drain is a known issue for winmo- you might try shutting off gps or your program while walking or driving to next cache area. Im sure its the same w/ the iphone, the constant polling does take a toll on the battery.