This is for the admins out there who have not heard of sage or Usenix or those that think that this is only for *nix people (Windows and VM admins).
I think that both of these groups are great and have memberships to both. They focus on issues that are important to IT professionals and provide a forum for a professional system administrator to learn and grow. Some topics have a *nix bias but beneath it all most of the current OSes are based on the same principles.
The conference proceedings are great.