Below I have 2 videos of DJ battles 11 years apart.  Even though the older footage is still amazing, the birth of USB midi controllers have certainly made a huge impact in sound in the span of a couple of years.

You be the judge, and remember, this shit is just getting started.

First video: DMC Championship

Year: 2000

http://www.youtube.com/watch?v=JvdikhQ50sc&feature=related

Second video: Traktor Scratch Demo

Year: 2011