Learn more about new Boost Ads : Advertising options - Google Places Help
Be sure to check out that link, and CLICK ON "WHERE WILL MY ADS SHOW".....YIKES!
Apparently Google is doing the typical metro rollout first, San Francisco, Chicago, and Houston being the first players. Although, I've actually also read elsewhere that Google left open a loophole of sorts, and that has enabled people NATIONWIDE to try out the service. (it may be fixed now though, i probably wouldn't even attempt it regardless....Places is a cluster of chaos.)
I guess some biz owners changed their Places address (city and zipcode) to one of those three major metros. If you save it in your Places dashboard, apparently an invite to BOOST will become available. You can then setup your budgeting and what not for Boost, then save your original Places information after a few hours. Might be something to play around with if you have some Places listings not doing so well, or you currently don't rely on for any type of income, etc.
Very very interesting folks....thoughts?