Had never heard of it until a couple of weeks ago....
http://www.spec.com.au/index.asp?sp=2&id=8495This was found at my local w/surfing/fishing beach!!!

I'll be on the lookout from now on, although, as always, once you start looking, you never find what you're after!

I must admit though, I have seen smaller pieces laying on the beach before, just thought it was some crap that washed in from off the reef! Too busy combing the beach for shark teeth, or washed up seahorses....etc.