MDX Script Performance Analyser on CodePlex
I forgot about this one - Chris "Master Chief of MDX" Webb is among the contributors to the MDX Script Performance Analyzer:
"...The MDX Script Performance Analyser allows the user to identify how much each calculated member, named set and scoped assignment in an Analysis Services cube's MDX script contributes to the overall performance of a given MDX query..."
http://www.codeplex.com/mdxscriptperf
