I'd really love to see .es domains. They are growing rapidly, as domain hacks. So far Ive only seen them at EuroDNS, maybe you can find yourself a niche there, since Eurodns, for lack of a better word, blows.
The domain hack market is growing, I see more and more sales of them on ebay and webmaster sales every day. I, myself, sold Pancak.es for $40, to be resold for $80.