Not that I get my hockey news from Time magazine, but someone sent this article about the history of the mask to me yesterday - http://www.time.com/time/arts/article/0,8599,1934325,00.html
The last sentence of the article: "While the NHL has required all players wear helmets beginning with the draft class of 1979, there's still no rule forcing goalies to wear masks."
I'm not a rules maven, but this seems hard to believe (esp. when you know play is halted when a goalie loses his mask in the course of the action). Can anyone straighten this out?