Another project I've been thinking about is an FPGA-based system for capturing images, guiding, plate solving, and stacking. Like, FPGA talking USB directly to the camera, no PC at all.
To be honest, it's probably not a great idea, but I think it would be neat. It would probably make more sense to use a small embedded platform with a GPU and use that for image processing acceleration.
I often wonder if the ASIair leverages any GPU acceleration. Live stacking has always felt too slow.