I just set up a Excel spreed sheet as follows;
Airline or Hotel / FF # / PW / Pts / 800 # / Segs or stays / last activity date
I've added some graphics & such to note status but its rather simple and works great. Been using this method for about 5 years now.
One of the cool things about this method is it allows to to sum up the Pts column to see that I'm almost a millionaire.