Finally found the "per site ad user widget" !!!! but...

But the plugin is forgotten by its author and dont know if that is compatible up to 3.0.4 or 3.1 now since rc2 is out.

Code experts could have a look at it, and shall we use it with the aaron mp blog registration plugin ?

the plugin :
http://wordpress.org/extend/plugins/add-users-sidebar-widget/

If that works or if we can make it work, we'll finnaly have at least a real multisite with wp3 !

thanks for tips :slight_smile: