The SuperDrive on my office workstation has stopped burning/reading DVDs. Instead of buying an internal drive replacement our IT department wants to purchase an external drive that can be shared between machines. As the specs on these drives seem to change constantly I'm wondering what recommendations people here may have. I do have one questions though: Can the newer dual-layer disks be read on my PowerBook 17 1.33 2X SuperDrive or on our other PowerMacs ComboDrives? If not I'll have to go with a regular DVD burner. Any buying advice folks?