Don't know much about the MAC OS myself, but for keeping tabs on your battery, setting up iconized groups of programs, watching memory usage, getting the close button to be a real close button, and handy formatting of SD cards, you should try SPB Pocket Plus. You can download a trial version at
http://www.spbsoftwarehouse.com/products/pocketplus/?en I find it to be an indispensable plug in on my Axim. I have been using it for so long, that until I read mach1andy's post, I had forgotten that there were other ways of checking battery and memory. I like pocket plus because it is all right there on the today screen, available with just a quick glance.