For some reason when my iMac today synced my bookmarks (via .mac) it added all my bookmarks again to Safari, so I had duplicates of every bookmark both on the menu bar and in the bookmarks themselves.
No idea why .mac decided that I needed to add all my bookmarks again.
This is (I have found) one of the problems with maintaining multiple bookmarks across computers.
I can add a bookmark on the iMac, it will sync, be added to my .mac bookmarks and then be synced to the PowerBook. As it should be.
But there have been times when I have changed as in updated a bookmark on the PowerBook and in theory this should update back, but I have found later that .mac has synced the old book mark back again.
Though what happened today is very weird. I will probably need to do a manual sync to replace all the duplicated bookmarks with a single copy from .mac.