Robert Weissberg has an essay posted in the Phi Beta Cons section of NRO called Academic Crimethink in which he analyzes how political correctness has crippled much academic research over the pas few decades. Read the whole thing.
I have one nit to pick. Mr. Weissberg refers to what academics do as crimethink. Actually, they are practicing crimestop to avoid straying from goodthink into the dangerous realm of crimethink.