sources.list para squeeze, bem completa

# Sources.list
# http://debianmaniaco.blogspot.com/

#mirros de segurança
deb http://ftp.br.debian.org/debian-security/ squeeze/updates main contrib non-free
deb-src http://ftp.br.debian.org/debian-security/ squeeze/updates main contrib non-free
#deb http://security.debian.org/ squeeze/updates main contrib non- free
#deb-src http://security.debian.org/ squeeze/updates main contrib non- free

#mirros oficiais
deb ftp://ftp.br.debian.org/debian/ squeeze main contrib non-free
deb-src ftp://ftp.br.debian.org/debian/ squeeze main contrib non-free
#deb http://linorg.usp.br/debian/ squeeze main contrib non-free
#deb ftp://ftp.us.debian.org/debian/ squeeze main contrib non-free
#deb-src ftp://ftp.us.debian.org/debian/ squeeze main contrib non-free

#Proposed updates
#deb http://ftp.br.debian.org/ squeeze-proposed-updates main contrib non- free
#deb-src http://ftp.br.debian.org/ squeeze-proposed-updates main contrib non- free

#mirro kernel
#deb ftp://mirrors.kernel.org/debian/ squeeze main contrib non-free
#deb-src ftp://mirros.kernel.org/debian/ squeeze main contrib non-free

#mirros volatile
#deb http://volatile.debian.org/debian-volatile squeeze/volatile main
#deb-src http://volatile.debian.org/debian-volatile squeeze/volatile main

# Debian Unofficial - http://debian-unofficial.org/
# apt-get install debian-unofficial-archive-keyring
#deb http://unofficial.debian-maintainers.org/ squeeze main contrib non-free restricted
#deb-src http://unofficial.debian-maintainers.org/ squeeze main contrib non- free restricted

#para usar os servidores abaixo basta remover o "#" e atualizar a lista de pacotes

#mirros multimidia
# apt-get update && apt-get install debian-multimedia-keyring && apt-get update
#deb http://debian-multimedia.org/ squeeze main
#deb-src http://www.debian-multimedia.org squeeze main
deb http://ftp.br.debian.org/debian-multimedia/ squeeze main contrib non-free
deb-src http://ftp.br.debian.org/debian-multimedia squeeze main

#compiz-fusion
#deb http://apt-get.if.uff.br lenny-ifuff compiz

#opera
# wget -O - http://deb.opera.com/archive.key | sudo apt-key add -
#deb http://deb.opera.com/opera/ squeeze non-free
#deb-src http://deb.opera.com/opera/ squeeze non-free

#skype
#gpg --keyserver pgp.mit.edu --rec-keys 0xd66b746e && gpg --export --armor 0xd66b746e | apt-key add -
deb http://download.skype.com/linux/repos/debian/ stable non-free
#deb-src http://download.skype.com/linux/repos/debian/ stable non- free

#google
#wget -q -O - https://dl-ssl.google.com/linux_singing_key.pub | apt-key add -
deb http://dl.google.com/linux/deb/ stable non-free
#deb-src http://dl.google.com/linux/deb/ stable non-free

#frostwire (KEY=EFD17969)
#deb http://apt.debianchile.org/frostwire squeeze main
#deb-src http://apt.debianchile.org/frostwire squeeze main

#esmka - programa para enviar torpedos msn gratuitamente
#wget -q -O - http://repo.palatinus.cz/repo.key | apt-key add -
#deb http://repo.palatinus.cz/stable /
#deb-src http://repo.palatinus.cz/stable /

# Cairo-Dock-Squeeze. Para a chave, execute o comando:
# wget -q http://repository.glx-dock.org/cairo-dock.gpg -O- | apt-key add -
#deb http://repository.glx-dock.org/debian unstable cairo-dock

# Enlightement
# wget -q http://packages.enlightenment.org/repo.key -O- | apt-key add -
# Se o primeiro arquivo não funcionar, pegar repo.key.old no mesmo link.
#deb http://packages.enlightenment.org/debian squeeze main extras
#deb-src http://packages.enlightenment.org/debian squeeze main extras

# Wine.
# wget -O - http://www.lamaresh.net/apt/key.gpg | apt-key add -
#deb http://www.lamaresh.net/apt/ squeeze main
#deb-src http://www.lamaresh.net/apt/ squeeze main

# Virtualbox.
# wget -q http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc -O- | sudo apt-key add -
#deb http://download.virtualbox.org/virtualbox/debian squeeze non- free
#deb-src http://download.virtualbox.org/virtualbox/debian squeeze non- free