"Online ads put web users at risk to viruses" says Avast

[vivek]

Avast! exposes negligence and poor security of major online advertising agents. Yahoo and FOX Audience Network top the list of compromised online ad servers delivering malware and virus filled adverts to innocent web users; Google ad serving platforms also affected

http://www.avast.com/pr-online-ads-put-web-users-at-risk

http://blog.avast.com/2010/02/18/ads-poisoning-%E2%80%93-jsprontexi/

Yeah I heard about it too.It's better to stay away off ads and from suspicious links...