Found some links... there's an article about the whole phenomena, in the LA Times . (You have to log in to read the articles, use this site to get username/passwords that will work)

A quote:
"The district does not approve of religious symbols — a category in which it includes Santa Claus — in classrooms or on hallway bulletin boards, he said. Its Christmas programs are now called "Winterfest" celebrations."

Kicking my holiday (holy day) out of public life altogether tends to make me cranky. And seriously, banning Santa Claus?

More commentary with lots of links is here and here . The first few lines of the second one won't seem relevant, but keep reading.

PJ