In light of the new "can the Air be your only macbook" discussions, I'd like to make a case for dropping optical drives all together. - Software is often downloaded, OSX comes on a stick now. - Movies are downloaded. 1080p blu ray quality itunes downloads will happen, it's only a matter of time. And unless you have a 46+ inch TV that you sit relatively close too, you will be ok with 720p for the near future. (Also, real movie lovers will probably have a standalone Blu Ray player, therefore no need for one in your mac.) - Dropping the optical from the macbooks will save room/weight/money. - Those who really need it, can use an external drive. Apple will most likely never have blu ray in any line up, has probably considered it dead on arrival. Also, having a bookcase full of discs is very 1998.