You want to show that in the skin, like in the sidebar of a blog? Or do you want it in the backoffice? Do you want plain text, or do you want each name to be a link to something? You could make each name a link to the url that users set in the backoffice. But a lot of users don't ever set anything.

I want to show it like "statistic" as a seperate link in the main navigation.
Need a file _members.php

But do you want each name of a member to link to something? If so, what?

I just want to show the members with the datas (nickname, email, photo, etc) from the admin "users".

would be nice to have a "statistics" of members. Would it be too dificult to make the member name's a link to that member's blog?