Just remembered I do have one student with an I-phone. Another thought would be with all the new full html browsers that are coming out on the new smartphones, why not make intergrate Logbook Pro to be fully intergrated into a website that could be acessible from any computer with Internet access, (AOPA recently did this with their Flight Planner, it's brilliant). You can take it one step further and make a simplified Mobile phone browser friendly version in addition, you would never have to worry about keeping software compatible with mobile phone Operating Systems. It wouldn't be quite as accessible (due to poor service areas), but it would be usable... and still more convenient than carrying a logbook. I would use it!