I received about a dozen emails so far suggesting an iphone application, some people even volunteered to help me write the application. Great idea, possible huge success, etc. ...
However, I would describe fitting elements on an iphone screen as... pure hell.
I am not saying it will never happen, just - not now. There is still plenty of room for elements to grow as a browser game for pc/macs.
Also, keep in mind that droid just appeared on the market this year, I have no idea about how apps for droid are developed and how successful it is going to be. But that might be another possible platform.