This download includes the "solution" version of the hands-on labs. In addition to the labs described under Starter versions, this download also includes these two samples:
Lab04Signed - a variation of Lab 04 (WordprocessingML Advanced) that shows how to programmatically sign a document with a digital signature.
Lab08SDK - a variation of Lab 08 (PresentationML) that shows how to create a document with the Microsoft SDK for Open XML Formats CTP.