Boxee is a cool Media Center for Linux. You can watch movies, TV shows and clips from the Internet on your PC/TV. The cool feature is that in a cheap way you can get shows and movies from the Internet on your TV. If you have problems installing this Boxee, just use their official forum.
Download Boxee: 32bit Deb or 64bit Deb.
IDJC (Internet DJ Console) is one of the DJ application available for Linux. This DJ application is equipped with cross fading, volume controls, audio level meters. The application provides two separate audio paths one for the listeners and other one for the DJ. So DJ can examine the effects without eating ears of listeners.