We've got an advisory up now:
https://blog.wikimedia.org/2012/05/14/ads-on-wikipedia-your-computer-infect…
Please don't hesitate to respond to tweets complaining about ads with
a link to this blog post.
--
Erik Möller
VP of Engineering and Product Development, Wikimedia Foundation
Support Free Knowledge:
https://wikimediafoundation.org/wiki/Donate