What are the Strongest Directories?

This is a great article from the people at Aviva Directory who have applied the Seomoz page strength tool to rank the relative importance and visibility of paid directories. The top 10 were as follows:

dir.yahoo.com
www.dmoz.org (not a paid directory)
www.business.com
www.exactseek.com
www..elib.org
www.familyfriendlysites.com
www.uncoverthenet.com
www.botw.org
www.chiff.com
www.ezilon.com

For a more comprehensive list of directories take a look at this post from Bob Mutch.