Dave Bush has started a great series on using and developing DotNetNuke modules.
As he notes in the intro:
"What you read here will not necessarily be the DotNetNuke sanctioned way of creating a module. But, it will be what really works. It will tell you what you have to do when and why you need to do it and why you might want to skip it altogether."
Ah....the "hacker's guide" to DNN. His post on the Label control outlines a lot of the functionality that you might not immediately grok when starting with the DNN framework. Subscribing to the RSS is a lot easier than reading page after page as well. If you're using DotNetNuke, check it out.
DotNetNuke Modules - DNN Controls - Label