REST and SOA

Mark Baker writes...

Gartner's claim that REST proponents rag on SOAP is backwards; we like SOAP, mostly. We just don't like SOA.

I consider myself a REST convert, to the extent I think I understand it and its incarnation in HTTP. Though I don't understand the position above. Is there even a concrete definition of SOA with which to make this statement?

I thought SOA was a fairly innocuous term, being so vaguely defined that an SOA could be built using REST and HTTP.