Allow me to plug a new advertiser--way down the page in the Blogads ghetto. Applied Genius is run by a friend of the Postrels who's a smart, generous cheapskate--the kind of guy who develops a spreadsheet so everyone he works with can figure out which health-care plan is the best for their particular circumstances. He treats saving money as a great game, and he's developed the site to share what he knows (and maybe make a few bucks in the process).
I can't fault his math, but I don't endorse his views on fluorescent bulbs. Aesthetics counts too. But at least "Mycroft" relies on persuasion rather than legal sanctions.