Is it really that hard to open /etc/apt/sources.list with a text editor?
Copy+paste a new repo, comment/uncomment, etc.
You can also use :
software-properties-gtk - manage the repositories that you install software from
software-properties-kde - manage the repositories that you install software from
Debian Sid KDE4.8.4 Kernel 3.4 Thinkpad R40 CPU Pentium M 1.3MHz RAM 2GB ATI Mobility 7500
Debian - "If you can't apt-get something, it isn't useful or doesn't exist"Giant Debian sources.list
| Debian upgrade script smxi
| sysinfo script inxi