AWS vs REST and XML-RPC

Ok so DHH in the release post for Rails 2 talked about how there was
clearly a side taken in the SOAP vs REST debate, and REST had one.

So what does that mean if one is wanting to create a small blogging
engine with Rails 2, and want’s to use an external blogging
application to connect with it?

Before it looked as if the Blogger API and MetaWeblog API were two
ways of going about doing this through xml-rpc, but we are now
“strongly” advised to move away from AWS.

I guess I’m not really clear on what to do, or what path to take. I’m
positive I’m missing some crucial point here.