GoogleAlerts just informed me that Cisco use Drools in their Active Network Abstract project. It's great to see Drools being used in big blue chip products in such a way that they haven't "masked" over that it's Drools underneath:
Cisco Active Network Abstraction
Cisco ANA Drools documentation
If anyone knows of any other products that use Drools, that mention it publicly, please let me know so I can reference them.