actually, if youre just upgrading from iTunes, it should have all the same settings after the upgrade. ive upgraded multiple times even on a computer ive never synced with before and if always turns out fine.
but if you want to play it safe you can always sync it, which should create a back up of the phone
Thanks everyone. iTunes handled it all for me (i synced before the upgrade just to be safe, which also backed up the iPhone, then downloaded and installed the 2.0 software, which also backed up the iPhone before flashing it to 2.0, then automatically restored all settings after the flash... outstanding!).