Just noticed last night that there was a referral being offered for the new Google Checkout service. You get a buck when somebody signs up through your site's ad provided the refer-ee spends $10 within 90 days thru Google Checkout. They also get a free $10 for signing up. So I put one referral banner on a few pages of one of my sites last night. The weird thing is that today when checking my site the checkout referral banners are gone and ads are in their place. Even weirder is that the ad links that are showing in place of the referral banner are contextual and are a 4th ad block now... whassssuuupp widdat? I didn't think Google would permit more than 3 ad blocks to show no matter how many you had coded on your pages. Anyone done this and are seeing the same??