A new version of Debian stable has been released! My firewall machine, entropy, is currently running the “old” Debian stable (etch). Sometime soon I'll update to the new stable release, Debian 5.0 Lenny.
Just for reference, here is how I will update:
edit /etc/apt/sources.list, change all occurrences of etch to lenny, then run these commands as root:
aptitude install apt dpkg aptitude
when it is done, then I'll have to reboot to start using the new kernel.