While I think this approach is along the right lines, the big problem is that it's incredibly hard to get passive job seekers to sign-up, so mostly you'll get active job seekers signing up and then you'll essentially just be another curated job board / CV database.
I think your key to success will be if you can figure out someway of getting lots of passive job seekers to signup.
Personally if I was doing it I'd go the route of making hyper-targetted mailing lists. So like a reverse groupon catering to specific niches. So have one for developer evangelists, one for flash games developers, etc. with the idea being that the niches are specific enough that people want to be on the list not because they're job hunting but because they want to keep their finger on the pulse of their niche.
(feel free to email me if you want to talk more about the developer recruitment space; I've spent a lot of time thinking about it!)