I’m not a full-time admin, so I greatly appreciated the Debian upgrade guide – it reminds you of all the stuff you have known in the past, but have “swapped-out”, and what tasks to do in what order. In particular, the kernel changes from Debian 5 to 6 were significant enough that a potentially unbootable system may have resulted.
MYSQL broke during the upgrade – the
dist-upgrade process appeared to install mysql-client rather than mysql-server which meant there was no server when rebooted, so if you noticed an error page for a short while, apologies. (Not that I expect anyone noticed as the background traffic is pretty low :)
And I allowed the upgrade to change more of my apache2 config than I should have – but that was a quick fix.