I had blogs with 1000's of drafts that were unpublished, because I imported RSS feeds with ABP or feedwordpress and it turned out that the feeds sucked and I didn't want to use them.
The problem of course was wordpress would only let you delete them one by one.
With this plugin
http://www.kenvillines.com/archives/000071.html
I was able to delete them all in about 1 minute. Very cool if you need it.