How do I upgrade my slitaz 3.0 to slitaz cooking? From cooking to 3.0 I used a command - something like tazpkg --set-release < version >. Is it still the same?
Releases are tested for 3 months prior to release after a complete freeze on the repository. Cooking however is like Debian Unstable - untested and in constant development. It's generally not wise to upgrade from stable to cooking because of MANY changes between stable's packages and cooking's ones. Basically, the easiest way to break stable is to upgrade to cooking using an OLDER tazpkg.
You could say the same about debian or fedora's unstable releases too. In fact, I dare you to upgrade Lenny to the latest version of unstable Debian and see how well it measures up in comparison.