I kept forgetting them whenever I need one so I’ll put mine here and be happy:

###### Debian Main Repos
deb http://http.debian.net/debian squeeze main contrib non-free
#deb-src http://http.debian.net/debian squeeze main contrib non-free

###### Debian Security Update Repos
deb http://security.debian.org squeeze/updates main contrib non-free
#deb-src http://security.debian.org squeeze/updates main contrib non-free

###### Debian General Update Repos
deb http://http.debian.net/debian/ squeeze-updates main contrib non-free
#deb-src http://http.debian.net/debian/ squeeze-updates main contrib non-free

###### Debian Backports Repos
deb http://http.debian.net/debian-backports squeeze-backports main contrib non-free
#deb-src http://http.debian.net/debian-backports squeeze-backports main contrib non-free

###### Dotdeb Repo
#deb http://packages.dotdeb.org squeeze all
#deb-src http://packages.dotdeb.org squeeze all

It should cover mostly used packages and will keep me sane. Also debian-volatile has been replaced with debian-updates (god knows why it’s called like that) since squeeze (6.0) but in case I need to take care a lenny or earlier (derp) machines, this should also be added:

deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free

Oh and Debian/kFreeBSD within a FreeBSD system is quite funny.

Update 2012-12-27: Use improved CDN.