Whatever happened to Adsense Display Ads?

An article in ecommerce times by Ben Elgin of Business Week mulls over, among other things "display ads" on AdSense

They were "sold" to advertisers and publishers nearly a year ago, but never really seem to have taken off. There should, in my opinion, be a big market to be exploited here, but few display ads appear instead of regular AdSense ads these days.

I accept that publishers have to "opt in", but I would think lack of advertisers is the root of the problem, not publishers lethargy. He concludes his article with

Quote:
Meanwhile, one of Google's best shots at building a new revenue stream receives scant attention. Last May, the company began experimenting with display ads -- which run atop or along the side of a Web page. It's enticing for big advertisers who are often as concerned with building their brand as they are with driving traffic.

Quote:
Still, 10 months after uncorking this service, Google is being strangely closemouthed. It won't divulge specifics about the number of participating publishers or advertisers. And the topic came up just once during Google's four-hour meeting with analysts on February 9.

- Y! MyWeb