yeah corona sdk (which is not free, but seems to be worth the price of entry from my dabbling) compiles for iphone and android from common lua codebase. The api docs are easy to read, tons of examples and plugins (box2d etc.). I threw together an ipad app for my "boiling water" game I've been joking about for years with corona in about an hour having only ever looked at lua from afar. If you grok js/ruby/python than lua will be simple.
