…and it looks like blog.crossedstreams.com survived!
The upgrade process described on the WordPress site is a bit manual and nervewracking, but (for me, at least) it went like a treat. And WordPress 2.8.3 sure beats 2.3.whateverIwasonbefore for look, feel and features.
Maybe now I can get that permalinks thing sorted. I also hope that the upgrade should resolve the issue where the blog is cut short in RSS feeds, but that remains to be seen.