I think it would be a wonderful idea if SO had a 'featured article' section. People with high reputation (say 5,000+) could post a detailed article about a given topic. For doing this they will automatically get 100 rep + more based on how many people upvote the article.
From my experience, some questions asked about very specific topic would really benefit from a 'how to'. For example recently I have asked questions about how to do integration testing of DAOs of a J2EE app that is build on spring + ibatis. Lot of answers were provided (some clear some not) but most included that the design should be changed so injections can be provided.
I know there are many sites that provide articles but none have the support that SO does and very few have 'hands on' no_buzzword articles. Using this we could further harness the knowledge and help other developers.
...i dont know how SO would make money from this but maybe Joel can conjure up something :)?