I might add that the Exbal program also works with the older Palm III PDA's as well. When I bought Exbal it hadn't been tested by perry systems for compatibility but it works fine. I just saw one on Ebay for $26 and the cradle to Hotsync with a computer for $5. Won't be out much if you drop it in a creek somewhere.
Yeah, i'm a firm believer in Exbal too. That reticle analysis is incredible. I use it for my Burris ballistic reticles, and plex reticles (user-defined) for myself + friends. That power factor calculation is pretty neat too. There's no comparison.