ken_b - 3:51 pm on Jun 1, 2010 (gmt 0)
I have FF 3.5.9 and IE 8.0 and see the ads display this way with both.
I'm mostly "add on" free, except for "old bar" on FF and Better Privacy. No tool bars, etc.
I also use AVG Free and Spybot S&D, if that matters.