I know of one consulting firm in Seattle that insists employees provide certification test results so that your passing score be known. Apparently, its on-staff MCPs are required to have passing scores above 900. Up until recently, I would have told you to make their job easier by listing your MCP certification ID number. However, Microsoft now suggests that you treat your MCP ID with a bit more discretion. If you consider your name unique enough that a mix-up probably won't occur, then leave your ID off the resume.
Endorsements Be sure to list each and every certification course and exam completed.
Too many in our industry gloss over their true expertise by casually throwing around the MCP title. If you've mastered and are certified in SQL Server, then specifically list it. Otherwise, don't lead the client or employer on. The MCP title doesn't make you a master of all BackOffice products, only those you're certified in. Last, let's say your creative talents far outweigh your other gifts.