Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
HD-DVD dual layer is 30GB
Blu-ray single layer is 25GB
Since intial Blu-ray discs are slated to be single layer only, HD-DVD does have an initial advantage although Sony will (assumedly) overtake them. However, virtually all HD-DVDs are (and will be) encoded in VC-1 which many feel is a superior codec as compared to MPEG-2. Additionally, VC-1 takes up less space per a given bitrate over MPEG-2. On the thread in question over at AVS, the guy complaining about HD-DVDs lack of size was using MPEG-2 for video. I don't have a horse in this race but 30 GB is plenty of space for most applications.