In the US, you have to pay for a demo of Killzone 2. Crazy days. In Europe, however, it's the demo will be free. Which is good news for Americans!
Yes, Americans. It's not good news for Europeans, because the second you start treating the fact a demo is free as "good news", you're fucked. So...carry on, it's business as usual
No, it's good news for Americans because this is a handy workaround to the "no free demo in the US" thing. Just create a European PSN account (if you don't already have one), and come February, when the demo's due for release, you're good to go.