I use a spreadsheet to do panel schedules during the design phase so I can calculate and/or balance the laods. I usually use a data base (file) program to do the final "as built" panel schdule. Sometimes I'll even get the thing laminated at the office supply store ($1) prior to attaching it to the door.
The nice thing about using your computer is that when the customer calls up asking about adding additional circuits, you can look at the schedule in your computer to determine if there are enough vacant slots & capacity left.
