The Serendipity blog software on people.planetpostgresql.org has been upgraded to 0.9.1 for all registered blogs.
It took a lot more time and effort than it should have, because somebody seems to think it's a good idea to require the webserver to have write permissions on the php files and the directories where they live in order to do an upgrade, which is obviously a horrible idea from any kind of security perspective. It also had some bad conflicts with the safe mode in PHP, which I still don't really know what it was - took a lot of hacking before it finally worked. I'm just hoping it's a long time until the next major upgrade...
For now - enjoy your new version!