BigDave - 10:47 pm on Feb 7, 2007 (gmt 0)

People tend to worry way too much about their OBLs leaking PR. You are much better off spending time working on your internal navigation structure.

If you think directories are all about outbound links, you probably haven't done a lot of link counting on directory pages. They are certainly heavy on their OBLs, but they are also heavy on internal links.