if u drag a file or folder accidentally (or for that matter, on purpose) to the bar it stays there...as a shortcut. if u DELETE that file or folder, you get...the question mark.
to remove it, open a window, go to View>Customize Toolbar, then...drag it off.
a puff of smoke, and it's gone.
Thanks guy. It's good to know what it is, but why it's necessary to have shortcuts there is beyond me. Doesn't look clean at all.
Oh well, who knows I might have a use of it in the future. I just thought Lion has crapped out on me. LOL