I'm interested in this too - as a consultant, there are a lot of cool problems that could make solid technical/architectural blog posts, but the issues of exposing client incompetence (real or perceived), or simply mentioning people who don't want to be mentioned keep me from doing it. Sort of a shame. We've solved some fun issues and it'd be great to get some comments on how other folks solved similar ones.

At the end of the day, unless your company is the kind that's desperate for 'thought leadership' style attention, it's not likely you'll get the OK to do much under official auspices.