There is a problem with Bootcamp 2.1 in that you can’t install the Apple drivers under Windows XP SP3. I recently bought a new MacBook Pro and installed Windows XP SP3 from an image and then tried to update the XP hardware drivers using bootcamp 2.1. This didn’t work an instead gave a nice cryptic error 2762. It seems it is not possible to install the drivers manually either as windows can’t install the drivers for the wireless network, iSight camera, and trackpad.
The solution is to install XP from a SP2 image (luckily I had kept one), then install the drivers, and then upgrade to SP3. I hope this saves someone a bit of time.
Update. This has apparently been fixed in snow leopard. I guess another reason to update.