Don't worry, it's nothing as malevolant as cracking passwords... While talking to a friend, I had a silly idea to create a Net::AIM bot that worked through all the AOL screen names to figure out the percentages of the 4 user types, and maybe how many screen names are actually still available. I did the math using the same base 36 idea as you, so I realized it was pretty much futile doing it like this. But I still wanted to write the code for it, even if the sun would explode before it finished... *shrug* Maybe in a few years when we have super nano quantum processors, I'll pull it off the shelf and run it then... Anyway, it was an interesting idea, sorta.

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