Detecting Network Sniffers

I came across a cool utility on the MSDN web site. PromqryUI (short for Promiscuous Query User Interface) is a GUI tool that detects network interfaces running in promiscuous mode (i.e. network sniffers). To download this free utility, go to http://www.microsoft.com/downloads/details.aspx?FamilyID=1a10d27a-4aa5-4e96-9645-aa121053e083&DisplayLang=en