Where'd it go?
Checking through the site's logs, it belatedly sunk in the I wasn't getting any incoming requests from Google searches (aside from image search). Before I was getting perhaps one or two per day(?), and found my postings generally in the first page of Google results obtained by the incoming visitors. Now incoming visitors are generally from MSN or Yahoo search. Why the change?
A several months back, I changed the link structure offered by WordPress to use "permalinks" instead of query parameters. Maybe that made the difference. Maybe Google changed their algorithm, and values weblogs less.