The NETTUTS blog has another WordPress-related post today that looks at "context includes" - changing the look and feel of the postings based on the content type they're tagged with.
The great thing about WordPress is that it doesn't limit how content is displayed, but provides a 'framework' of ways to do so. Even better, it's possible to change the display according to the content. When writing this tutorial it was hard to explain what's going on... But the best way is this: the post will be displayed within the loop according to its content - or contextual differences. Either way, it's including specific files that match up to the category of the post.
There's plenty of code to go around introducing you to the parts of the typical WodPress install you'll be working with and some CSS to help you style the resulting changes. You can download the source and check out a live demo of the end result.