interesting thread on a big torrent spy about zango
 

torrentspy.com is a rather large torrent site saw they had a notice on their page

main page

ANNOUNCEMENT:
There has been an infestation of popups and viruses appearing on the site lately. This is not something we are doing, it happens because one (or more) of the ad networks we are working with is being dishonest with you. There is a more detailed discussion

from thread:

Advertising on the site is done through 3rd party networks. These networks work with advertisers (and often other networks) to run ads on the site.

Sometimes however networks and advertisers try to make money for themselves by cheating you by running code that attempts to install spyware on your PC. There are lots of places that do this and tracking them down is extremely difficult. It is a snipe hunt because they do redirects to redirects and often target specific countries, times of day, and show at random times.

scummy - but not suprising.