Recorders only
BluRay was designed from the start as a Recording medium; pre-recorded discs were only an afterthought, because the people behind it thought the future was all about people taping stuff off HDTV. So while HD-DVD has many technically nice things about it, its use in recording devices really isn't one of them.
@Scott - as a HD-DVD player owner, I wholeheartedly agree that 30Gb is enough for a pre-recorded title. However, this is the case because the advanced codecs allow you to squeeze a movie in that space easily. When used as a blank disc to stuff video on from off the telly, more capacity is a really good thing. Partly to give you more hours of recording, but also because it means you can use a simpler, cheaper encoding path that well and truly outweighs the costs from the BD-ROM format.