Compressed Air Hybrids On Instapundit
Instapundit has, in its telegraphic style, picked up on the compressed air hybrid meme. He's linked to a company called Scuderi Group that makes air compressors. They're hawking a split-cycle engine, where compression and expansion are performed in separate sets of cylinders. For just a few hundred dollars more you can interpose an air tank and make the engine capable of storing and reusing compression energy. They have a publicity blog here.
I've previously discussed this kind of technology. Let's hope something comes of it.