Here is an excellent spreadsheet to track your progress if your doing the classic version of the program. I print out the sheets and write down all the reps during the workout and then type them in later. It's also nice to be see your progress each week through out the 90 days.
P90X Spreadsheet
I didn't create this, I got it off this forum.
http://www.weightloss-hq.biz/weight-...x-forum-2.html