Adding Remote Publishing

I decided to implement a remote publishing API for my blog software. I want something that Windows Live Writer can communicate with (Really Simple Discoverability, Metaweblog API, or Moveable Type API).

• This is the IE7 extension that I want to use.
• Here's the RSD stuff. This can't be the definitive source for documentation is for RSD, can it? I guess so.
• RFC: MetaWeblog API has the details for this API. Is there a SOAP based API for publishing?
• The Movable Type API.
• Here's a requisite XML-RPC library that would be handy if I do the one of the XML-RPC API's.
• Here's a weblog for someone who is really into this stuff.

UPDATE: I ended up using the XML-RPC library which already had Blogger and MoveableType interface API's, I just implemented the necessary code to talk to my own BlogDataProvider. Windows Live Writer is a nice little application, one big annoyance is that every post seems to create a new window -- a real nice improvement would be a MDI interface.