It would be good to have a part of Crowd that allows reporting users in a group. For example, often, as a Crowd admin, I forget what users are in what group. It would be great to have a tree-like breakdown of all the groups, sub-groups and member users. I think something like that should be a separate tab all together. The reporting could eventually be extended into user-activity on individual applications and such (which is why I would think it to deserve its own tab).