I agree with the answers at http://answers.yahoo.com/question/index?qid=20090323155447AA7aHzs
It will run. The CPU is fine, but as you suspect the GPU will have you pull back on the settings and not leave the laptop on your lap.
So I need a new laptop. Just going to be using it for basic everyday stuff but I do want to be able to play Crysis. Currently using an Inspiron E1505 bought in '06. Love it. Built this one online tonight. I know it will do everything I need it to except I'm unsure of how well it'll run Crysis, it's the only game I'll probably play on it - and yes I am buying a laptop, I do NOT want a desktop.
4GB RAM (Add $70 I can make it 6GB... would it be well worth it?)