I'm embarrassed. I'd started re-using the old Blosxom code from 2003, that I'd heavily modified over the years, to re-post this blog on 757.org. The one thing that I didn't do was test the links in each of the stories. It was only when someone tried to link to one of my posts (sorry Wim), that anyone noticed they were all broken.
To make it short, I've regenerated the entire site and pushed it back onto 757.org. If anyone sees any other bugs, please give a shout.