This is a simple trick I think most of us know but it may sound good for newbies or whoever don't have a idea about this trick. No need to delete complete history and type repeated url s again next time just for the sake of removing specific URL .
Go to:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\TypedURLs
in the right pane you'll see the urls .. jus delete the one which you don't want to appear again in IE add bar.
