Hi to Fermi Lab from a Theoretical Physicist.
Scientific Linux 5.1 is Great!

This is my Corporate Server's software configuration:
DELL PowerEdge 400SC
Scientific Linux 5.1 (RedHat Linux Enterprise 5.1) with Secure Linux
IBM Lotus Domino Messaging Express Server v8.0.1
HylaFax Server v5.2.5;  MySQL Server 5.0.45
Amanda Tape Backup Server v2.5.0
Sun xVM VirtualBox v1.6.0