For the record, it sounds like you haven't made the transition from introvert to extravert. You've made the transition from shy to not shy. :-)

That said, my advice is to hit up various meet up groups or go somewhere like noisebridge. Find someone who's interested in what you're working on, and then... Just ask. It's really not totally different from asking someone to go out with you if you think about it.

Hacker Dojo, down in Mountain View, is a nifty hackerspace down started by a few friends of mine. There are always clever people congregating there.