So we know Google is seriously testing AJAX search results and Google has confirmed that. We know Google was not passing referrer strings to the receiving sites, but Google promised to fix that. But these changes are going to be coming to a Google search result near you, so you need to be aware of it.
Matt Cutts of Google posted a video explaining a bit more about these changes. It is well worth watching the 3-minute video:
Forum discussion continued at WebmasterWorld.