360 Backwards Compatibility Lacking In Japan
Gamespot reports that the backwards compatible list for the 360 at launch in Japan is ... somewhat abbreviated. From the article: "While the US list of Xbox games playable on the Xbox 360 has more than 200 titles, the Japanese list only carries 12 games. Microsoft Japan notes that additional titles will be added to the list in the future, so it might be a matter of time before the remaining games from the American list appears."
Given the extremely low sales of the Xbox in Japan this isnt suprising. Just let a few games that sold well play and dont worry about the rest is probably thier strategy.
The original XBox did quite poorly in sales in Japan, for a variety of reasons. Obviously MS is hoping to do better with the XBox 360 (eg. smaller footprint, launch in US and Japan at the same time, many more japanese publishers signed on), but one would naturally assume that backwards compatibility for the 360 isn't very valued by consumers in Japan, compared to the US. As such, it's only logical for MS to spend less money on that.