Thanks to Scott McLeod in his post, The Results Are In. There was a survey of edubloggers (I did not participate), that received around 160 responses, and in Scott's representation of the results, the slide below struck me:

I felt I was reading about why I started to blog, after many failed attempts, with more regularity. The reflection and voice results are particularly close to my own interests, and while community and learning and the rest are all important to me as well, blogging allows a reflective voice, to a greater or lesser degree, more than most media today IMHO. Perhaps that is why reflective practice and its sibling, the gap between research and practice, are so engaging of my energy.