DoDonPachi and Ketsui for XBLA
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Jesus. The world's not ready. According to this, Cave shooters Ketsui and DoDonPachi Dai Ou Jou Black Label are going to be released on XBLA at some point. If you've never heard of them, watch the following videos to get an idea of what to expect. No idea on date or territories for these as yet.
Update: This sounds a bit cock-eyed. Apparently the games are going to be retail packages, not XBLA games, so don't get your hopes up about being able to play these outside Japan just yet.