Not an article, but a book: "Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solution" by Hohpe and Woolf (You don't need to rea

Not an article, but a book: "Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solution" by Hohpe and Woolf (You don't need to read all the patterns in detail; reading the overview will be enough to get you a pretty good idea. You only need to read the details when you seriously consider implementing a pattern).