http://wordpress.org/extend/plugins/wp-o-matic/
what i think this does is scrape from RSS/Atom feeds and auto post them. i like this idea not so much for generating content, but rather as a way to find interesting things “out there”, i.e. top 10 bizarre boyd modifications, etc. along those lines.
http://wordpress.org/extend/plugins/add-from-server/
i like this one because you can navigate the webserver and upload into wp direct. think photo gallery. of course the draw back is the doubling up of content.
http://wordpress.org/extend/plugins/quote-rotator/
eh, this isn’t really a serious one but then again there are always quotes that haunt me, so why not.