George has discovered the hidden cost of Yahoo’s embrace of RSS. It only refreshes the RSS feeds it allows you to put on your My Yahoo! page if the source of the feed pings Yahoo’s ping server. (Details in George’s post, from Yahoo! tech support, or on their page for publishers.)
For those of you playing along, that’s now 12 services that accept various kinds of pings as notification that your blog has updated. It’s a good thing that the Ping-O-Matic guys make a central interface (and API) so that you only have to make one ping call.