Having an outbound link script is a good idea for many reason. You can quickly and easily change particular types of links throughout your site. You can control the flow of PageRank, and you can keep search engine spiders away from paid links that they don’t want to see. This post goes into how to build an outbound link script using PHP.

For a while now the City Room Blog on nytimes.com has had a PageRank of zero. I wonder aloud how this could be and ultimately find the answer (an incomplete PageRank update).