Yep still using it here.
Netware 6.5, Zen 7 and GroupWise 7.
I believe we are the only ones still using it in the county now!
Know of one school using it in nearby Bath.
We have around 30 SX280's and have had no problems booting from cd. Check the BIOS settings to make sure CD drive is enabled. F12 at start up and if it's enabled it will be listed.