Nice but probably useless information in 2005.
At first I thought it is HD burnable CDs but after a few search I realized that HD burn and DDCD is not the same thing. (right?)
I think Sanyo's HD burn technology would have been famous if DVDRW didn't cruise well. A lot of existing CD media can be burned with twice more data, though most ODDs don't support to read it. It seems DDCD really requires a new media. hmm.. even worse than HD burn. what's the advantage then?
Anyway even HD burn is pretty much dead now; people are discussing HD DVDs.