So I've been meaning to fill Synchronizer's "Special Commands" section:

The User Loader I mentioned a few days ago would be a good one to build a custom button for; then two days ago salesforce.com Engagement Manager Matt O'Connor asked me if there's an easy way to create Public Groups and assign users to them by User, Group, or Role. . . I think I see how to implement that in Synchronizer.  

My goal: have two more buttons for that lonely, lonely space before the wkend's out.  On your mark, get set, code!