Yeah i'm getting this too,
from a few IP's, seems to be yeildmanager.com though. (the ad provider)
link referred to:
http://ad.yieldmanager.com/st?ad_type=ad&ad_size=728x90§ion=646524&x=http://ad.uk.doubleclick.net/click%3Bh=v8/38c6/3/0/%2a/a%3B216921208%3B0-0%3B0%3B30510340%3B3454-728/90%3B32456788/32474664/1%3B%3B%7Eokv%3D%3Bsz%3D728x90%3B%7Esscs%3D%3f
content:
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