The following list contains my entries for Adblock Plus, a great add-on for Firefox that can block content originating from certain servers. These few entries were enough to block almost all of the annoying content for a long time.
/[_/-]ad(s(erv(er)?)?)?[._/0-9-]/
/^https?://([^/]+\.)?doubleclick\.net//
/^https?://([^/]+\.)?atdmt\.com//
/^https?://..*129\.125\.101\.92/
/^https?://([^/]+\.)?zango\.com//
/^https?://([^/]+\.)?adultfriendfinder\.com//
/^https?://([^/]+\.)?fastclick\.net//
/^https?://([^/]+\.)?adform\.net//