Well, I’ve successfully upgraded to WordPress 1.5. It seems to be working nicely and the upgrade was quite straightforward. I had to do a bit of work on the template to make things validate again and I had to set up a new theme to make the index page work correctly, but it wasn’t terribly difficult.
Update: After a couple of days of working with the new version, I’m liking it very much. If you’re using WordPress and haven’t upgraded, I recommend doing so. The new “pages” feature is quite handy and it handles plugins better as well.