This morning you're encouraged to head to FilePlanet, which is running an exclusive multiplayer demo of Monolith's upcoming No One Lives Forever prequel, Contract JACK.
According to the site, this demo uses FilePlanet's Beta Protection System, which means that you have to use a registration key during installation, you must be connected to the Internet the first time you run it, and that you will be forced to install the demo on no more than one PC and for a single user only.
Terrifying. Still, if that doesn't bother you, then the 109.5MB demo should be on its way to you very soon - with something like 19,000 people already having downloaded it, apparently. That should throw up plenty of opposition for the demo's deathmatch/team deathmatch, Doomsday and Demolition modes.