In a Google Groups thread, JohnMu has asked the Google Webmaster Help community for some help. On behalf of one of his colleagues who is performing a case study, he's looking to gather some intelligence from the very nice people out there who are willing to participate. Here's the request:
I'm looking to personally work with a selection of organisations willing to work with me on a project using Google Website Optimizer to try to increase conversions on their website. In exchange for my time and the insights gained from using Google Website Optimizer, Google would gain the right to present the project publicly as a case study for the promotion of Google Website Optimizer / Google Analytics.
If you're interested in participating, there's a Google Spreadsheet to fill out first.
Forum discussion continues at Google Groups.