http://www.spyany.com/program/article_adw_rm_Zango.html
http://www.yourtechonline.com/art15_zango.php
Zango is a bad program. They pay users to distribute their adware approximately 40 cents per install. Many people get infected through free screensavers and other free software programs. Not sure if they still allow people to package it with screensavers but not too long ago people were creating tons of screensavers wrapped with the zango spyware and submitting them to software directories.