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All the MCSD shows is someone can read a book. Good, flexible and stable coding is the real proof to a good programmer. I've interviewed dozens of anacronym laden lads over the years and a very few were able to answer relatively simple questions if they had been using the software (VB/.NET/C/etc.) for more than a year.
If you're looking for one because you think it looks good on a resume, it might not be worth it. If it's because you want to learn more about it, then it's great but expensive.