Gridrunner++ is a downloadable Windows game with a sizable following, an awesome pedigree and sheep. Happily, it's coming to Xbox Live.
According to Jeff Minter, the game's author, he's busy modifying Gridrunner++ for 360, specifically adjusting its aspect ratio and ensuring that its original mouse controls are translated well to the 360 pad.
"I'm changing and extending the gameplay; it'll be a much more involved game than the PC-only predecessor. I'm getting all the gameplay working first then I'll overhaul the graphics; we'll likely go for algo generated 3D shapes rather than the hand-drawn sprites of the PC original." Minter posted in his blog.