I use google docs to track everything, I have 3 years of daily weight measurements, keep a track of my lifts, keep notes on everything..

http://www.arcturus.com.au/sean/weekly_weight_2010.png

http://www.arcturus.com.au/sean/weekly_weight_2011.png

http://www.arcturus.com.au/sean/chart_latest.png

Large gain of 5+ kilos this year - trying to get squat past 140kg, hah. Playing rugby next year.

The biggest key is keeping a record. Doesn't really matter what you do, as long as you log it.

Good luck!