mildly relevant, Ken Lewis likes to do a thing he calls the "10 minute mix drill". the goal is to take your tracks, completely dry, pull all the faders all the way down and give yourself 10 minutes to mix the song. you really lose perspective when you sit and try to eq the bass drum for 3 hours. obviously he doesnt submit these as final mixes but its a good exercise for learning whats really important in the mix, the balance of all the levels not all the plug ins and such.
http://www.youtube.com/watch?v=7UQjqbz2NpQ