Of course, there are no packages for Jackfield yet. Rather than mess about with installing Jackfield, I badgered Stuart Langridge to do it for me. So, I now have a working shiny clock thing. Making packages for Jackfield requires solving a few problems, like gconf keys for showing Jackfield and multiple instance detection.
My conference tradition is to occupy myself with activities completely unrelated to the main topic. For instance, at DebConf I hacked on GNOME stuff, at GUADEC I hacked on Debian stuff, and at LinuxConf.eu I did very little. At PyCon UK, I've built the wireless-dev tree of Linux, and got the new b43 driver to run. So, it works. It appears to have increased the transmission power of the card, and limits the bit rate properly, so should work at longer ranges without fiddling about....