On top of Space Invaders Extreme and an interesting looking Wii version where you guide the iconic aliens on a path of destruction, Taito has Space Invaders Sekai Taisen (Space Invaders World War) in development. Unlike the other versions of Space Invaders this is for PCs and designed as an online game. Control in Space Invaders Sekai Taisen differs greatly from the classic arcade game too because there is no joystick to use. Players shoot aliens by pointing and clicking with the mouse.
Space Invaders Sekai Taisen also includes a world ranking system, which (I suppose?) lets players take national pride in their alien shooting skills. Taito plans to release this in Japan in April and as of now Space Invaders Sekai Taisen is not scheduled for any other regions. It’s going to be a lonely world leaderboard until other regions hop on the point-click-compete Space Invaders train.