Hi Tom-

A long while ago I promised you that I'd update the RPC client transport 
switch design doc and put it under linux/Documentation, once the switch 
is integrated and stable.  So I dug up the most recent version of the 
client xprt switch doc, and posted it here:

   http://wiki.linux-nfs.org/wiki/index.php/RpcClientTransportSwitch

Is this the most recent version you remember?  I culled it from my 
2.6.11 patchset from two and a half years ago.