OS X :: Sorting Safari Bookmarks - Removing Duplicates

I tend to skim an article or web site and if I see something of interest I bookmark it for later review. The forgetful part comes in when I find myself bookmarking the same site several times. One thing I have to admit about the old IE that I used to use was it would warn you if there was a duplicate addy already in your favorites folder.

I'm stuck with tens of thousands of duplicate bookmarks (maybe even millions). Safari doesn't seem to offer any sorting solutions to weed out the duplicates or even organize them (by name would be cool) other than manually doing it. The prospect of manually picking out dups from the billions of links I have collected over the past few minutes alone is daunting. Any suggestions before I start sorting the trillions of links one at a time?