First, a prelude - though I've mostly written technical articles on this blog, it's called techfounder for a reason - it was my original intention to also talk about startups from the view-point of the technical founder. I have been involved in several ventures so far in this role (currently at Binpress), each giving me more perspective on the overall picture.
I've just stumbled upon a nice article titled "Why you can('t) recruit a technical co-founder". The author makes some solid points about why it's hard to recruit / find a technical co-founder for a startup, but it seemed more common sense than deep introspection.
Idea is nothing, execution is everything
If you've started up your own venture, you know this saying is not just a cliche. Ideas, however great, will get nowhere without execution. On the other hand, solid and above execution can get very far with even below mediocre ideas.