I want to snail mail some stuff on a flash drive, formatted as MS-DOS FAT (using Disk Utility) so both Macs and PCs can read it. Will any old flash drive "just work" on XP/Vista, or do I need to worry about drivers and be careful what brand I choose? I want things to be easy for my client--I don't want "new device" installation and security dialogs all over the place if I can help it! The drive will contain a REALbasic app (a Mac version plus a Windows version) that will run off the drive. Thanks for any advice/warnings!