One of the hardest things to do in any of the more popular CMS is to create and extension or module. This is because the easieer it is for the end user the more complicated the code and procedure become for the programmer. If you are not the originating programmer then you have your work cut out for you. Depending on the level of documentation and the willingness of others to part with needed information it can be easy or hard. Sometimes though you just need a good "Hello world" script to get you started in the right direction. Petr Vojtechovsky wrote an excellent tutorial on how to use the new MVC framework in Joomla! to create a component. Here are the files.
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Author:Petr Vojtechovsky