SELinux for Humans
Paul Wayper gave a couple of talks on SELinux at this weeks' SLUG meeting, and includes links to a couple of very useful slide decks:
The sysadmin slides look particularly useful, as they focus on solving common issues such as running FTP/SAMBA/Apache servers, and provide some very useful general tips, such as looking in the audit log and using policy booleans for high-level policy tweaking.
These slides may be the best, short introduction for sysadmins on the topic that I've seen. It's a difficult thing to get right.