I’ve discovered two new question and answer resources for administrators: one is specifically for system administrators, and one is for programmers.
These are StackOverflow.com and ServerFault.com. These sites look and work similarly, though the topics and logos and color schemes are different, so while it is as easy to use one as it is the other, there is no doubt as to which one you are using.
These sites combine a number of things together to provide excellent community answers to questions posed by anyone. There is no registration required (!) but if you register, you can do more and you can build a reputation that allows you to do quite a lot. If you get a high enough reputation, you almost have full access – just like the administrators of the system.
The answers are excellent and the Q&A sets are building rapidly.