I follow the main principles of HIT as described by Mentzer. I've put my own twist on things to suit what I respond to. My workouts are under 30mins each and I do just one working set per movement but go to failure, do static holds, controlled negatives when using machines (I workout alone). My basic routine is like this...
Monday - Legs and abs.
Wednesday - Chest and arms
Friday - Back and shoulders
I am making better progress with this method than I ever have before. Maybe it's not for everyone, but I think if more people tried it, they would understand.