Go2Linux posted a tutorial about upgrading from Debian GNU/Linux 5.0 to 6.0

As with the post of How to upgrade Debian Etch to Lenny, I actually know this may be know by a lot of people already, but here is how I did it, and if you ever forget can come here and remember it.
Debian Squeeze is going to be released on February 5th or 6th this 2011, so I am updating this how-to a little bit

How to upgrade Debian Lenny to Squeeze