Debian with Code Name Lenny

After realeased debian with code name etch, now debian launch testing version for new debian "lenny", what is testing? its mean that things should not break as badly as in unstable or experimental distributions, because packages are allowed to enter this distribution only after a certain period of time has passed, and when they don't have any release-critical bugs filed against them.

Please note that security updates for testing distribution are not managed by the security team. Hence, testing does not get security updates in a timely manner.

For more information you can visit official site debian, or at wikipedia.