If you have Panther, you know to drag and drop folders into the sidebar. What I never liked was the real estate that the sidebar took up. Also, I have two folders that I have applied custom icons to, but they don't show up in the Finder windows. I noticed that there is a stopping point on the divider -- it stops right at the outside of the icon. Now the problem is that I don't know what each of the folders are. I have custom icons for everything else, but what if I want to put 10 folders in there?
Apple thinks of everything, eventually. If you move the divider to the edge of the icon, after you roll over the icon, the name shows up immediately (to the right), as seen in
this brief movie. After you have sized the sidebar down, it remembers to stay with the icon size when you resize the window.
Anyway, I thought that was a really cool thing for Apple to think of.