This is one area of the Salesforce.com platform that I’m no fan of.
In short, you code a complex application and it’s beautiful. You marvel at the wonder of the sleek UI, the intelligent complexity of the code, and the comprehensive unit testing you’ve implemented. Now you wish to package your application up, advertise it briefly and have the customers pour in. Not so fast my friend.
Packaging can be a nightmare, and there are certain hurdles to this step that you won’t find officially documented.