When I first visit a new client, I take inventory of their machines, what is on them, stats, and other useful information. Up till now I would either write the information down, or just try to remember it myself. Then I decided why not write a script that would allow me to gather all this useful information, and put it in a format that I can understand and possibly print. I created that program (its even listed in this thread).
I then expounded on my ideas, and have created this great Compute