I just purchased a hp ipaq 5910 and would like to use HWR for business trips. Am I correct in assuming there's a basic HWRv built in? If so is the ritepen program compatable with this unit and worthwhile enough to learn and use? How does the Calligraphy 8.0 match up against ritepen?Also how much memory does this program take? I've been trying to find some kind of comparison chart between the different HWR programs out there and no luck so far. Can anyonone direct me?