I have told you all that I would post this a while ago so here it is. This is the class I use to dynamically grab data via amfphp programmatically in actionscript 3 without needing to create a remote object mxml node.
I have been looking for a way to upload a file in flex and save the bytearray directly to drupal via amf. This was written on Drupal 5 however it can easily be added to Drupal 6. Just note there is already a file_services module in D6 and not d5. Here's what I have come up with that works great: