I wrote him back, of course, with the note below (also in his blog comment), explaining that the public information isn't quite good enough:
What fun! I don’t mind at all being the subject of your blog, as obviously I put out a fair amount of personal information already. In my particular case, however, the home address that appears by the methods you outline provides my mailing address, but not the location of my physical house. In my community here we have a shared mailroom, which means that 200 residential addresses all start with the same street address. My house itself has a different address that’s used by only a few contractors and service providers. (I should also add that one of the other services came up with me living in Bellevue, WA, which hasn’t been true since 1993, meaning that its pulling from outdated public records. J)
Fortunately, what I have not shared is something like an aerial photo of my house location, because if I did, you’d be able to look around the location of my mailing address and find the house itself.
At the same time, if you drove into my community, you’d probably find a sufficient number of friendly people willing to point to the house especially if you had my name and claimed to be making a special delivery or something.
I should add that quite a few of my neighbors probably aren't entirely sure where our house is, exactly!