The Rebate Mechanism (RM) proposal gained further support at a side event at the Bonn Climate Change Talks entitled: "Ensuring no net incidence on developing countries from carbon pricing of international transport", held on 8 June 2011. See:
Event flyer & RM keys | Optimal Rebate Key Study (0.6MB) | RM Presentation (0.7MB) | RM Outline and keys (2-pager) (0.3MB).
For recent discussions at the IMO see: GHG-WG 3 summary.
The debate was very good and covered technical details as well as ongoing negotiations on the matter.
You may wish to review the RM Presentation (0.7MB), read the Optimal Rebate Key Study (0.6 MB), grab the RM Outline and keys (2-pager) (0.3MB) or see the GHG-WG 3 summary.
The Rebate and Attribution keys for nearly 200 countries are also available as handy 2-page summaries, in three languages: