There was a good write-up on that from 37signals http://37signals.com/svn/posts/2991-behind-the-scenes-ab-testing-part-3-final http://37signals.com/svn/posts/2

There was a good write-up on that from 37signals http://37signals.com/svn/posts/2991-behind-the-scenes-ab-testing-part-3-final http://37signals.com/svn/posts/2991-behind-the-scenes-ab-tes...