HD-DVD is a dead format, all things considered.
Blu-Ray is the winning optical HD media disc format.
Currently there are no Blu-Ray recorders outside of Japan.
In the US, they might be a while coming, if at all. You see, around 15% of TV viewers use OTA, and not a whole lot more use it with a pay service. Most people subscribe to a pay TV service, which such recorders will likely not be compatible with, or the providers will do what they can to limit their use.