Simple and clean, both the offer and the site; I like it.
You might want to think about some kind of satisfaction guarantee. I for once might have a problem shelling out $400 for a 2h talk with a guy I never worked with without one. I'd actually make it a "money back plus a beer on me" guarantee.
If you had a stackoverflow account I'd definitely link to it; too bad it's not possible with Forrst.
I'd also publish your HN karma. Seriously. A big, automagically updating number, showing that you really are about community, sharing, brainstorming and all that jazz. :)