For the past three years I having been posting my own
workouts using a free blog on www.blogger.com.
I've found it a very simple way to record the workout performed, the weights I used and the time in which I completed it.
It's quite easy to search the blog to see when I last did a particular workout and I can compare all of the times, and weights used.
Another nice item is that you can see how many workouts you did for each month, plus for the entire year, just looking at how many "posts" you did.
I know that it is very simplistic, but sometimes simple yet effective is better than complicated and costly.