In the WebmasterWorld supports forum (to click on the link you need to pay) there is a thread named Radio Advertisement: (Just Google "keywords") where Shak (very nice guy) tells us about a radio commercial he heard.
Basically, you know when you hear a radio commercial and they say; call us at 800-###-#### or visit our web site at www.domain.com? Well, this time, Shak reports that the commercial ended with the phrase; "Just Google us for: "Keyword Keyword"."
This is very similar to visit us by "AOL Keyword _____" which we all heard before, but the big difference is that AOL Keyword was/is guaranteed, but not necessarily the Google keyword (paid or not paid). Bold move, nevertheless, and I wonder if this will continue (I bet it will).