This is the sources.list file used for Debian Lenny. It contains the main repositories adapted to point explicitely to lenny instead of stable. More repositories may be found at the official apt-get site.

# 
# deb cdrom:[Debian GNU/Linux 5.0.0 _Lenny_ - Official i386 CD Binary-1 20090214-16:29]/ lenny main

deb http://security.debian.org/ lenny/updates main
deb-src http://security.debian.org/ lenny/updates main

deb http://volatile.debian.org/debian-volatile lenny/volatile main
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main

# added

# general packages for lenny
deb http://http.us.debian.org/debian lenny main contrib non-free
deb-src http://http.us.debian.org/debian lenny main contrib non-free

# unofficial
deb http://ftp.debian-unofficial.org/debian lenny main contrib non-free restricted
deb-src http://ftp.debian-unofficial.org/debian lenny main contrib non-free restricted

# multimedia
deb http://www.debian-multimedia.org lenny main
deb-src http://www.debian-multimedia.org lenny main