Yesterday I released version 1.6.1, which is a maintenance release for the 1.6 branch. It fixes a single bug that was pointed out by Jorge on the support forums on wordpress.org. The Excluded Users setting wasn’t being applied to the Top Users shortcode or widget. This is a bug that has been around since the feature was introduced back in 1.0. So a big thank you goes to Jorge for sniffing it out!
(For those wondering, meanwhile, the work on 1.7.0 is progressing as well.)