I do so love it when Excel is used for electonics purposes. However in your case I see it was only a tool to support your insight.
I hope you don't mind if I subvert the thread and point your readers to my blogs on the use of Excel in electronics on Planet Analog. There are at least 4 more to come over the next 6 months. One is due out any day now.
@Antedeluvian - of course I don't mind! I am also looking forward to more of your articles. I have a very good book called Excel by Example by a guy called Aubrey Kagan (unfortunately now out of print) which has some very good Excel tricks in it. I learned a lot from that! :-)
@Zwede - as I said, for the uninitiated you could use it as a decimal to binary converter for numbers less than 64. Just write "32 16 8 4 2 1" and underneath those numbers, write a 1 if your number is on the corresponding card, and 0 if it is not. Bingo - Binary representation of your number!