Squeeze was released this weekend and it's time to slowly migrate servers to it. The first to upgrade came the ones backing up phpMyAdmin demo server. Reason for trying them first is they have mostly same setup as other, while definitely not being critical to run all the time. For simple reasons that users break them time to time as well :-).
Everything went surprisingly smoothly, the only problematic thing being no availability of MariaDB packages for Squeeze right now. But it does not matter that much, as Lenny packages still work fine.
There should be no visible changes on the servers, but in case there is something broken, please let me know.
While having experience with upgrading database servers, I went to production database server and it is now running Squeeze as well. What still remains is the server doing virtualization, but I prefer to do this in time when I can quickly get to the housing, in case something goes wrong with the reboot.