There are 3 additional LiveCycle samples that we have made available at our website.
The first sample utilizes Reader Extensions and Assembler to cover the scenario of enabling a pdf document for review, then compare and merge the comments using Assembler.
The second sample goes through various mechanisms for validating a PDF form before additional processing can occur. Three specific approaches were illustrated: LiveCycle Forms API (processFormSubmission()), LiveCycle Reader Extensions API (exportFormData()), and XPAAJ (exportFormData()).
Finally, the last sample shows how to apply a policy on a PDF document.
The samples can be found at http://www.ensemble.com/samples/adobe/livecycle