I can't tell you how happy I was when I was told (thanks Didou) about the demo release, I've been looking forward to this ever since the original came out, I really loved that game.
The demo is a Fileplanet exclusive (that means you will need to register to download) but I'm sure it will just be a matter of time before other websites start hosting the demo, so be sure to post any comments if you find a copy somewhere else.
Enter here for more info on the demo and Fileplanet registration.