I use GymJournal.com
It will calculate the weights for you based on your previous performance. I doesn't do periodization well because it uses the previous workout. I'm doing a heavy, light, medium routine right now and I just print it once a week and it works fine.
The print out is quite handy and easy to read in the gym.
You can track physique changes and nutrition but I don't use those features.
Stu