I’m glad advertisers are finally noticing how stupid banner impressions are. I, for one, welcome our new Ajax overlords.
UPDATE: Let the record show I had this a day before Slashdot 
Ajax May Undermine Web Advertising, Analytics Models
"If sites track traffic and sell ads based on pageview impressions, everything changes when users start interacting with the site and making multiple changes without ever refreshing a page. Does all of that count as a single page view? Or do we need to count clicks, or use a stopwatch to time how long they spend on each ‘page’?" Paul writes.