This is my apt sources list. If you just need a quick setup for your Debian, copy & paste this text into /etc/apt/sources.list, save the file and then update your package cache with apt-get update. Please note that many of the unofficial repositories listed here exists to serve non-free, non-gpl and/or other commercial stuff.

After you have configured your sources, you may check this post for some cool packages you can download using apt-get.