Amazing Daft Punk Radio 1 Essential Mix – check out from 15 mins in, Daft Punk were mashing it up in 1997 – mashup people take note! (from Ian Fondue).
There’s loads of Essential Mixes (over 900!) on this Soundcloud link – all to download too! Basically if you wanted a good lesson in the last 20 years of dance and electronic music, there’s probably no better place to start than the Essential Mix.