If you didn't notice Google quietly just turned on AJAX search results. 
What's AJAX'ing search result pages do?
That means you don't need to reload and re-render an entirely new search result page when you type in a new search query. Only the parts of the page that changed need to be replaced (the results and ads). Re-rendering an entire new page is slower because the browser must look at the HTML, parse, render, and interpret JavaScript every time you load a new URL.
Why does this matter?
Money money moooooney. Site speed is a huge deal for search engines. Speeding up your results usually means more searches. Which also means more ad clicks, bing bing :).
I have a feeling this was in response to Bing being faster than Google when Bing launched. At least we know Google is on it's toes. I'm still a share holder.
Full disclosure: I worked at Google as a software engineer on AdSense from 2003-2007.
2009/08/29
Google speeds up in response to Bing!
2009/06/08
New York Times goes social...

Now when you log in to NYTimes you'll get a login bar like the one above.
2009/03/23
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