... and besides the "special offers" that Mr.Wharty linked, of course your main benefit as a MCP is that you can accredit your knowledge to your current or potential employer or clients. To this end, you can download a MCP logo displaying your specialty,
as well as a Certificate. You can also order an Id wallet card displaying your certification. All of this (and more) is available from the MCP private website after logging-in:
http://www.microsoft.com/mcp