In case you haven’t seen them there are a number of groups for Mac OS X Systems Administrators on LinkedIn:
- Mac OS X Server: http://www.linkedin.com/groups?&gid=138085
- Final Cut Server: http://www.linkedin.com/groups?gid=138082
- Xsan: http://www.linkedin.com/groups?gid=138084
- MacEnterprise: http://www.linkedin.com/groups?gid=1774398