matrix_jan - 7:34 pm on Aug 17, 2012 (gmt 0)

Got it too, and since it looked like it was generated to fit almost everyone, I just ignored it... Earlier this year I've received an email (not a message through adsense) which was from a real rep asking to move some ads to a certain location for better performance...

I'd say publishers are not favoring the large rectangle much, and adsense just sent this email to most of them to trigger more placements...