This is a great article in working progress that Tom de Manincor prepared and let me tell you, it is really right on. He will be posting more sample codes and more information as he continues with his progress. You can look at the article using the link below:

http://ortus.svnrepository.com/coldbox/trac.cgi/wiki/cbArticleUsingCustomPlugins

Tom, will be contributing to documentation and samples.