In a recent issue of Search Engine Marketing, Chris Boggs writes an article about internal linking.
In the article he describes an example of the power of internal linking.
He describes an excellent example of the value of internal linking by using the search term "insert printing".
Its a phrase related to newspaper insert advertising.
Apparently in 2005 the G3 Group optimized a page specifically to perform for this term. This term may have a dozen or more websites...