A lot of people are suspicious of cookies and about the only thing that can't be done without them is auto-login. As for a member's habits on the site are concerned, I can get that information from the database. SQL is a beautful thing
However, if people want auto-login they by God they shall have it!! That's kinda the whole point of the thread. This is actually a genuine opportunity for people to quite literally design "The ultimate eBook site".
Cheers.