Hey, I have two devices where I play CC, but it sucks that there are "two game states". So how about to include a CookieClicker Cloud, where the Savegame will uploaded (maybe all 5 mins. to solve traffic/performance).
You could use Dropbox (where is a great (unoffical) JS SDK) or use a own implementation. If you need help on the server side I could help (with PHP)
The feature should be optional so that you can use it if you want.
It would be fantactic to backup my empire on a safe place and use it at many computers.