I don't have a Macbook, but most any external DVD (preferably a FW version) should be compatible with iDVD. I think that Tiger added the necessary drivers or whatnot to allow iDVD to "see" and use external drives, whereas you had to use Patchburn for older OS versions. I have a Powerbook with Tiger and a Pioneer OEM drive in a Bytecc case that works fine for everything I have used it for. I don't use iDVD, but I know that the app "sees" the drive as usable.