How do I find good technical co-founders? Is there any particular resource or technique in finding competent technical co-founders?

First off:  You need to do a thorough self assessment to determine whether or not you are ready to take on a technical co-founder.

Technical people tend to have a very dim opinion of "idea guys", many of whom just want someone to build their dream business for them.  As technical professionals in today's market we have a lot of interesting and lucrative opportunities chasing us on a regular basis, so you need to have a compelling value proposition that goes beyond money.

You also need to have a very specific and actionable idea, with an understanding of the target market.  very good technical people tend to shy away from vague and unformed ideas.  Those who are willing to come onboard when the idea is vague and unformed may be less experienced and less in demand (the ones you don't want).

You also need to understand and be able to clearly articulate your own value as a partner.  Technical people are generally (but not always) lacking in sales and marketing ability, which may be your forte.  Technical people also tend to avoid getting bogged down in the minutiae of operations.  That may also be a key area you can add value to.