If you haven't downloaded the demo for Crysis 2 from the PlayStation Store yet, now is probably as good a time as any, as Crytek will be coming online this weekend to play with you.
They'll be online to kick some ass, but also answer questions people have about the game. You can find a full list of PSN IDs at the PlayStation Blog (see source).
They will be online between 6-8pm GMT on Saturday, the 19th of March. So you still have a few days to grab the demo and put in some practice rounds.
Source: PlayStation Blog