Well, I started off doing a different body part each day for about 3 weeks, then got out of it (partly due to laziness, partly due to school-work overload). Took about 3 weeks, and started back power lifting about 2 weeks ago.
I've done about 3 weeks of p90x before. I liked it, but it was hard to pull (ripped the DVDs from a friend, and didnt have ANY equipment, so i had to write down the workout and wait for stuff to come open at the gym. Not really practical.
On Monday, Wednesday, and Friday, I do bench, squat, incline, power/hang clean (hang on wednesday), leg press, and push press. Tuesday and Thursday, I break down the small muscle groups throughout my body and do cardio.