это для testing
$ cat /etc/apt/apt.conf
APT::Default-Release "testing";
APT::Install-Recommends False;
APT::Install-Suggested False;
[kron ~]$ cat /etc/apt/sources.list
deb http://security.debian.org/ testing/updates main contrib non-free
## testing
deb http://ftp.de.debian.org/debian/ testing main contrib non-free
deb http://ftp.de.debian.org/debian/ testing-proposed-updates main contrib non-free
## unstable/sid
deb http://ftp.de.debian.org/debian/ unstable main contrib non-free
## experemental
deb http://ftp.de.debian.org/debian/ experimental main contrib non-free
deb http://ftp.uni-kl.de/debian-multimedia/ stable main
deb http://download.skype.com/linux/repos/debian/ stable non-free
deb http://deb.opera.com/opera/ lenny non-free