Is there MetaWeblog API support in the OPML Editor blogs?

Has anyone out there had any luck in using the metaWeblog API to post to their OPML.org blog?

I can do it with a WordPress blog, and I assumed Dave’s system would support it. There are references to it in the .root files.

I tried to send an xmlrpc message (metaWeblog.newPost) to:

rpc.opml.org with a path of /RPC2 to port 5337 – with the appropriate parameters (I hope)

The server replied that metaWeblog was not defined. I’m quite suprised by this. I must be doing something wrong. Anyone got any ideas?

Also, does anyone know where I might find a list of blogging system which support the metaWeblog API? I notice that blogger.com is moving over to the ATOM API, which makes life slightly more complicated.