After much testing, tweaking, fiddling, fumbling and learning from a few mistakes, my blog is now running on 1.5. My old design has been scrapped completely in favour of a minor variation on the default theme.
At the same time, I've moved from a Windows-based host to Dreamhost, so I've got nice permalinks for the first time since moving to WP.
I'm using WP pages for other parts of the site and Matt's Intelligent Menu script.
Apart from that, it's the same old nonsense as before :-)