I'm thinking about buying DVDSP4, but I have a couple of questions... Does it let you burn to an external firewire drive? (I recently bought a lacie external 16x) Can you make dual layer disks? And im kinda confused on the whole H.264 concept. On apples website it says you can store HD content on current dvd media using H.264. If this is possible, what is the whole thing with blu-ray. Thanks!