heh - this is a good one... Remove Internet Access, LAN only access Remove CDRW burners from dev PC's Remove Floppydrives Remove/disable USB ports Remove any network printers from dev PC's Remove/diasble com & parrallel ports Hire honest people and pay them enough so that they won't feel that stealing your software is necessary. I don't know how many of the top pieces of information are actually feasable in your instance - but I worked at a place that had nearly that exact same setup...

it is ashamed...but...things change, bricks break and buildings get rebuilt.