You can definitely burn video playable in HD players through OS X. Toast 9, with the Blu-Ray video plug-in works, though is apparently a bit buggy by the sound of the forums (and not working fully with all burners, to boot), and Adobe's Encore burns working Blu-ray video discs. I'm hoping DVD Studio Pro gets support soonish before I spring for a GBW-H20L or something like that. Even if it doesn't, being able to back a whole standard project up to a single disc (or compressed HD...) as a raw project file with media is handy as another backup solution.