How much of the Mythical Man Month still applies? 
spokey: This strikes me as a strange question. What aspects of the Mythical Man Month do you feel no longer apply?(That is, it has been a while since I last read it, but I can't think of anything specific about TMMM that seems out of date as long as you take into account the historical context. Maybe the "surgical team" stuff is a little bit bloated relative to the scope of many projects and the strength of many tools now-a-days, but I think you need to mentally account for improvements in infrastructure and ecosystem as you read it--standing on the shoulders of giants and all that. If memory serves, most of the underlying themes seem still valid and relevant.)