I am trying this again in case it is related to server performance problems at blogsome.
Update: still no title. I wonder if there is a way to fix that?
Result: does not contain valid XML and it didn’t update even after about 15 minutes.
Update: trying the Moveable Type API that it gives for Wordpress on the Common APIs and URLs page.
Result: Server response does not contain valid XML but it posted fine (and with a title). Now to test updating posts from Writely with these settings…. Apparently because of the error message Writely doesn’t recognize the document as “blogged” so it doesn’t give me the option to update.