I think it depends entirely upon the workouts you're doing - if you want to do total body twice a day, 4-5days/week, heck yeah you're overtraining.
But if you did 1-2lower body movements in the morning and a couple upper body lifts in the evening, and did this 3days a week, I think it's a viable option.
I think Chad Waterbury wrote something like that on T-nation...I'll have to look...