Is this new?

http://img167.imageshack.us/img167/5319/flickrhomezw0.jpg

http://www.flickr.com/

I don't see any adverts so I guess it must be.

Nope, that's been there a while. Not that particular ad of course.

I think Jared is right:
http://images.google.com/images?um=1&hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=%22flickr+homepage%22&btnG=Search+Images

Martin Porcheron – Do you use an adblock addon in your browser? That would most likely block the ads on that page.

It looks like half the ads come from doubleclick.net and the other half were being fed from ads.yimg.com which I believe is Yahoo's own ad system.

With the Google acquisition approved, do you think Yahoo will drop the use of DoubleClick?

Nope, I checked in IE7 and FF3. I'm seeing ads now though, but not on every refresh. Although they appear on the majority of loads.

Google's cache isn't showing any ads:
http://64.233.183.104/search?q=cache%3Aflickr.com&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a

I noticed about 10 ads when I was refreshing the page over and over to see what ad companies they were using.