Stupid!
That's really annoying! Just because I have something bookmarked, doesn't mean I necessarily want it popping up on my address bar all the time! There are some sites which I like and visit regularly, but which, due to my own or my friends' hangups, I don't want them finding out about if they hop on my ibook to check their mail.
I wish there was a way to create a secret, private bookmark file that would require a password and would not display in the address bar. I know I can lock my admin user account and only let others use a secondary child protected account to sign in and use the machine, but that gets tedious, especially when the whole point of privately surfing is PRIVACY!
Otherwise, it would be nice if the list of autofill sites for the address bar were separate from the bookmark list and could be edited.