Don't know if your still reading replies from this post, but I would suggest ignoring big games and or already popular games, and focus on the small community. You never know if there is a small game developer out there that's currently making a really nice game but is struggling to get attention.
Thanks for the post. :D I'll be keeping my eye on this thread for more ideas by other game devs.
Man, I had no idea how many great games and demos were being made until I really started hunting for these games. Some have amazing, unique, fun game mechanics. Others are absolutely gorgeous! Looking forward to finding more games. :)