Ieup!
I've done a function in lib_custom.php that allows a Geeklog webmaster to create a block that makes a list of all the users in the website. I use it for the "logged in" group, so they can view other user's profiles, even if they are not online. I think this feature is so useful, because in my weblog (http://bilboweb.dtdns.net/gente/kacikekola) there are so few users (9) and this way I can allow users know something about other users.
The function is here:
I think its code is "standard" for any Geeklog, as I've used system paths and so on.
Finally, thank you all for making this wonderful piece of software, I'm enjoying it a lot