posted a couple of pics of my brake caliper fiasco here:

http://shufti.wordpress.com/2011/02/03/bleeding-failure/

I hope it serves as a warning to others :)

btw, I have to say again, I did not apply very much force at all on
the bleeder to make it break. It was short wrench and I was on my side
under the van, awkward position, not a pose where you can really get
some oomph behind the wrench.

alistair