Microsoft is in talks with Treasure to bring Radiant Silvergun to Xbox Live Arcade. For the three people out there with a working copy of the Sega Saturn original I suggest you sell it now before we can all play it for 800 spacebucks.
Sadly, Treasure hasn’t said yes to the project yet. Apparently it would take quite a bit of work to bring the title to the 360. Please say yes, Treasure – if for no other reason than to have both Ikaruga and Radiant Silvergun running on current hardware for an affordable price.