Here's another radio station that's switched over to Christmas music on Halloween:
89.7 Shine.FM out of Chicago
(a part of "Olivet Nazarene University") has switched over to 24/7 Christmas music today! Yes, it has an online link, but it says I need a plug-in for it to work...(wonder if I can listen to it through DAR.FM...)
Found it through mention of at this source here.
EDIT: Actually, that may be for today only...it's unclear if it'll keep playing Christmas music tomorrow...