A very good article, well written. But, I totally disagree with this statement:
1-way Outward Links Are Toxic –
there are many sites who’s content is 99% links and the have great PR, google, other search engines, guides for particular industries.
for example this site: http://www.allwindsor.com/ It’s only outbound links, it has PR (i can’t see right now because i don’t have toolbar on this maching) and it ranks for local businesses that it features.