Debian Etch has been serving me well for a few years with wonderfully easy and infrequent maintenance.

However it's at the end of its life

http://www.debian.org/News/2010/20100121

So I've upgraded to Lenny following these instructions

http://www.debian.org/releases/lenny/i386/release-notes/ch-upgrading.en....

It was remarkably painless

One small problem with the mail system.