I've used this module in some intranets where people has different levels of access and where there are a couple of different groups of people with disjoint roles. An interesting feature would be to only display information for users in the same roles as the current user (not sure if it's possible).

Another interesting idea would be to filter out which roles you don't want to be displayed on the module. For example, I don't want my "admin" or "host" accounts listed on the who's online section.

Alternatively we could add the roles that should be included, instead of the ones that should be excluded.