I have been involved in the beta testing of a product that would make crackers think twice about cracking a network. This product, 5th Column, by Sergeant Labs, La Crosse, WI is a PHENOMENAL product. You can tell if there are port changes occurring, if known hack tools have been run on any of your machines. They are past beta testing now and have it in operation. If any of you are remotely interested in SECURING your networks, you owe yourself and your company a look see at this product. No I don't get a kick back for this either. 
Just doing it to help the cause. Oh by the way users or hackers will NEVER know it was installed on their machines and it can traverse your network in seconds and start reporting in minutes!
Visit their site
Just doing it to help the cause. Oh by the way users or hackers will NEVER know it was installed on their machines and it can traverse your network in seconds and start reporting in minutes!Visit their site