Just want to start a running thread of how everyone splits their muscle groups up through the week.
I personally do this:
Day 1 - Legs/Back
Day 2 - Chest/Triceps
Day 3 - Shoulders/Biceps
Day 4 - Rest
I'll do abs every other day. Cardio every other day.
I've been doing this routine for a few years now and I feel as though spreading it out some would allow for more focused intense workouts. One such example would be to give legs their own day since they're so extensive.