You're right that quality will become an issue for such a collaborative tech blog. To do it properly, the posts would have to go through some sort of peer review and editorial process - hopefully community driven. In fact, this could form a nice quality gateway... Basically, if your article cannot get two other people to agree to edit/review your article and either "fix it" for you or approve of your resubmission with the recommended changes, then it is just quietly left to languish and die unpublished.
As somebody who would want to publish articles here, I see another benefit of a peer review process--it would make sure my writing is good enough and, hopefully, help me improve it. So I see a system like that not only maintaining quality, but helping the authors as well.
