[Haskell-cafe] Looking for numbers to support using haskell

Hi all, I'm looking for articles that provide some technical support for why Haskell rocks. Not just cheerleading, but something with a bit of real information in it - a comparison of code snippets in multiple languages, or the results of a study on programmer productivity (given all the noise and heat on the topic of type checking, surely there's a study somewhere that actually provides light as well), etc. Basically, I'd love things that would turn into an elevator pitch of "I can show you how to be X times more productive than you are using Y", and then the article provides the evidence to support that claim. Thanks, Mike