The best is yet to come. Doug's group seems the most interesting. Door clip, germ filtering toilet seat, safety car seat. The toilet seat is the most revolutionary and novel. The door clip is practical. The car seat could be popular if it works. My bet is with the inventor that develops their product most.
The british guy has a word game that's been done, the bald woman with a sweat sheild that's a small market and the toner belt that's also been done. This is a tough one but I think the word game looks the best from the photo's I've seen.