This thread on the MacFixIt forums discusses a hack to move items that would normally be on the right side of the dock (folders, hard drive icon, etc) to the left side of the dock. It's quite interesting, and some people might like to have things on the left instead of the right.
It requires a bit of work in the terminal and an editor, but it's not too intimidating.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010422005121665