dir.yahoo.com - Yahoo! Web Directory www.dmoz.org - The Open Directory Project www.lii.org - The Librarian's Internet Index www.bluefind.org - The Bluefind Web Directory
You got the question from Seomoz Quiz? If you did, I posted BlueFind. As a while back, John Scott's directory was de-indexed for getting too many crazily high PR links
do you mean it was baned by google for many high pr site link to it? if yes, compeitor can link to a site with many high pr site to let it banned.
Blue Find was banned by Google not because of the links but because Blue Find was blatantly selling the high PR status that it had achieved as a result of the links.