Surely the beta-testers download seeds (probably via torrent?). Aperture and iWork are available via download. Still retail copies of OS X can't be downloaded? They could certainly use a key as they do with Aperture and iWork, and honestly, anybody who wants to steal software already is, but this would make things convenient for the rest of us. I would far prefer to have a download option and then burn my own DVDs. Optical media is so 20th century.