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Pioneer DVD9-R info –
"Pioneer Corporation has proceeded to the development of dual layer recording on DVD-R discs.
The first measurements on the two layer DVD-R discs showed that the jitter for the fisrt layer is 9.34%, the reflectivity 17.3%, while the same measurements for the second layer were 8.08% and 19.5%, respectively. Playback compatibility with the current DVD players is expected to be high.
Although the limited information about the technology background, dual layer DVD recording is definitely a major step beyond and expected to boost the sales of DVD writers."
Reflectivity seems rather low but if it works that's great. I think it's Philips who's working on a +R dual layer disc. Both technologies should be interesting.