I started wondering why java.blogs wasn't updating my blog any more. It doesn't seem to be updating most of them, in fact. Looking at my profile, I discovered that the ‘next update’ was scheduled for December 28th. Some time over my Christmas hiatus, the site had just stopped bothering to look at the fishbowl any more.
Going to the weblog editing page, changing nothing and then hitting save triggered a new scan, and seems to have fixed it.