People always bring up Jobs and Woz in these discussions. IRS a useful example, but not as an example of fate or extraordinary luck. It's a great example of one of the most common, reliable ways to find a technical cofounder. Jobs immersed himsel in his local tech scene, where he met Woz and started working on stuff with him. Rather than mythologized or fetishizes the pairing, is it so strange to think Jobs might have checked everyone out, ascertained that Woz was the best guy there, and then chose him as his guy? Sure they became friends and all, but I think it's important to realize Jobs made a deliberate choice when he started hanging out with Woz. He wasn't groaning about not being able to find a dev, he went and met them all, spotted the best guy, and started a company with him.

Jobs chose Woz. If you can't find good people and get them on board with your plan, no web app or meetup will save you. Go out. Meet people. Choose the best guy whose company you enjoy and make friends.