Posting twits in reply to others worked easily, proof of concept on Scripting News yesterday.
Now to try to get it working the other way -- when someone responds to a twit how do I pick it up. The threading info is in the timeline, cool, so now I need to upgrade my glue to pass it up the stack in the OPML Editor.
The inReplyTo info is there even if the twit was created with a tool that isn't IRT-aware? Huh wonder how this works.
Made changes to the glue, released, now I'm getting the information transmitted to higher-level code.