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