tedster - 4:19 pm on Aug 16, 2010 (gmt 0)
Today I'm in Manhattan and have had a chance to see this SERP up close and personal. I also compared it to the SERP I saved over the weekend. Some observations:
1. The "Last 2 months" is not some accidentally triggered filter - it's the default when you do the [car rental nyc] search and it triggers this 'hyperlocal' results page. In fact a search on [cinema nyc] triggers a similar SERP and says "Last 3 weeks" by default, and some other local terms show this variation, too.
2. On the [car rental nyc] search, the order of results appear to be organic, and the clickable title and snippet are as they would be in organic, but the actual URLs for several of the car companies (Avis, Enterprise, Alamo) include their local tracking query string.
3. I still can't say what conditions are triggering this hyperlocal SERP. Yes, the user needs to do the search from within the same geographic area, but that alone is not enough. Two computers in the same office, same ISP, same browser (FF) but only one sees this test SERP page. And we can't get it to display on IE for any computer.