"Advertisements placed by Google in Web pages are being hijacked by so-called Trojan horse software that replaces the intended text with ads from a different provider, Romanian antivirus company BitDefender says."
http://news.zdnet.com/2100-1009_22-6223511.html
How safe are google ads now, Danny Carlton?
Google text ad Trojan detected
Google text ad Trojan detected
"Experience is something you don't get until just after you need it"
As safe as they ever was, I guess.