oh...ok
well i dont know if this will help at all, but this excerpt from avast scan log may hold a clue.
perhaps one of your pages links to this other site.
i'm not a techy so i may be way off base here....just trying to help.

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12/13/2009 10:51:33 AM SYSTEM 1648 Sign of "HTML:Iframe-inf" has been found in "http://pixhost.eu/avaxhome/avaxhome/2007-08-10/Brooke_Burke_Z13X.jpg\{gzip}" file.

les

Hey Dag,
I have a hard drive that was infected by malware at statcntr.com on 1-6-2010.
You mentioned you would like a copy of the file.
I'm not sure if I know how to do that, but with some coaching I may be able to get it to you if you are still interested.
The infected hard drive is external to my current pc which shows no sign of the malware infection.

let me know

In reply to this comment by dag:
Well, here's what I know:

I've contacted our ad networks to see if they had any info about it - neither claim any knowledge and say it's not part of their inventory.

I've used my VPN to become US-based and tried about 40 reloads with Chrome- but can't make it happen.

StatCntr.com seems to be triggering on BoingBoing and TweetMeme as well:
http://search.twitter.com/search?q=statcntr.com

Still looking into it- if anybody gets it and manages to snag the source code that is around it- we'd love to have a look.

Thanks