What makes a great mixtape? Is it the same as what made a great cassette or has the world changed?

I ask, because we have a bit of a competition and would love to hear all your highlights of the past 10 years for this first week of stuffz.

First entry comes from one of Metronomy and is really awesome way to set the bar rather high from the off http://www.mixcloud.com/OLUGBENGA/diolch/

Comp info here: http://drownedinsound.com/news/4141301-blackberry-competition--make-a-mixtape-win-share-a-mixcloud-win