I've found that the networking aspects of jobseeking are not only critical in breaking past the resume firewall but are also among the hardest parts to manage, particularly trying to balance several open opportunities and inquiries.
The approach of systemizing all open opportunities, though, is brilliant. I'd suggest finding a way to integrate contacts & contact history within the site, almost making it more CRM-like, to make it a jobsearcher's dashboard.
As to a business model, I'm not sure it's immediately robust enough to begin as a subscription service and I'm no longer sold on advertising as a sustainable revenue stream, particularly with niche web apps.
Frankly, partnering with a LinkedIn might be the best outcome, but it's a real longshot. With the market for unemployed jobseekers outnumbering employed jobseekers, it's going to be a tough opportunity to make money on.
That said, best of luck - it's really quite brilliant.