Basically, my title says it all, is there instruction on how to optimize your profile on careers.stackoverflow.com so that you come up in more employer searches? (I mean aside from the obvious — like "fill out your profile").
Well to me SO Careers profile seems to be most SEO-friendly of all other online profiles I've been using so far (there was half dozen at least). Without knowing actual mechanics of how it works I wouldn't bet on that but anyway "it walks like a duck and it quacks like a duck" to me.
Note by the way main page of your Careers profile says "Employer View - searchable".
Good thing about SO careers is that it allows to inject SEO stuff in a way that looks justified to reader - in case if one is active in answering questions or writing blog (like I noticed you do) or at least in reading books and web articles. It's not a rocket science really...
Few minor points about above.
PS. My own profile is not quite optimized I'm afraid: instead of focusing on few key areas, its content is rather spread over wide range of different topics. Guess when (if:) I decide that profile may benefit of SEO boost, I'll have to cut about half of it.
It seems that the "likes" are a large factor in search results — changing whether I liked a given technology changed whether or not I even placed in the search results for that tech (at all).