This made me realize that Google's click to call functionality that I've seen in their search results from time to time should be, if it's not, just be routed through your Google Voice account.
They could even allow vendors to run real-time Groupon-like promotions to certain targeted users as part of their AdWords campaigns.
I'm glad you liked it. Yes that would be a crazy idea. Adword ads with "realtime" phone responses. Click the advert and you call the company.