Don indicates his trials in finding the SOAP 1.1 spec now that http://www.w3.org/TR/SOAP appropriately points at the latest 1.2 spec.  I ran into the same problem on MSDN.  Seeing as I had neither a mirror or Don's tattoo (and although I heard about his blog post, I hadn't visited), I guessed http://www.w3.org/TR/SOAP11/ and it worked!  A little easier to remember than http://www.w3.org/TR/2000/NOTE-SOAP-20000508/.

This should be fixed shortly on MSDN.

Of course when SOAP 11.0 comes out I may have to update my link again. :-)