Sucuri Security, which keeps a close watch on this site of mine, has found in the wild (though not here, not yet) some malware masquerading as Google AdSense, using the dubious domain google-adsens.com. The purveyors thereof are counting on your not noticing the spelling. This is an old and established Sneaky Trick, as anyone who’s ever gotten an email from paypaI.com can tell you, but it still works often enough to be given a fresh lease on life every now and then.
Also floating about: operaupdatenow.in, msnupdateserver.info, and firefoxstabs.com. The latter might persuade some people: who hasn’t wanted to stab Firefox lately?