Cave, known for fantastic, frantic shooters like Muchi Muchi Pork and DoDonPachi, has posted an email account where folks can, among other things, send requests for games they want on home consoles.
Keep in mind, that Cave is asking Japanese users to send in Japanese emails for which games they want on Japanese Xbox 360s. But! Cave shmups can't be that hard to localize, and we're fairly confident that Cave would be interested in knowing if players outside Japan are interested in having Cave shooters on consoles outside Japan.
Here's the email address: blog360@mail.cave.co.jp
We imagine emails in English are okay, too!
Cave Blog [Official Site]