i mostly kept track of where they were geographically and kept track of trends there. i kept track of the duration of memberships based on traffic source and geography. i kept track of frequency of login plus how much time was spent per visit and what was downloaded.

when i was working with a program using NATS, i was able to know how many times each guy came to the site before joining - and that was revelatory. more than i had expected came by a site multiple times for a period of 2 months before joining. a bunch of guys came by for 1 - 2 months between 3 - 6 times before joining.

i