Well, with Windoze XP, you can at least sync the 5600 using the default rom.
For rom flashing, you generally need a CF card, so if you haven\'t purchased one yet I would do so. (I would purchase a CF card anyway, for file storage and the like when you\'re \'on the go\'â„¢).
Unfortunately, when it comes to different roms on the 5600, there aren\'t that many to choose from. Some people have (apparently) had success in flashing the OZ 3.3.6-pre1 ROM and making the Z usable under it. Since I have yet to do any ROM flashing myself, I would advise you to make good use of this site and it\'s search feature to find out what works and what does not.
Same thing with keyboard mapping -- use the search. It will be your new friend. :-)