[Richard Flynn]

Nice work, good integration. Only problem—for me—is that the ID your script generates for messages in Mail only holds true while they are in the same mailbox (folder) within Mail. Move a message, and the link from OmniFocus no longer works. The Message IDs generated by zooids' original script, however, are unique to the message, and don't get broken when you move messages between mailboxes. I do really like being able to open linked messages within the preview pane of the main Mail window, but I think it's more important that the links continue to work, regardless of where you move the message to!

Plus, the latest builds seem to recognize the IDs generated by zooids' scripts as URLs, so you can now right-click on the links in the note attached to an Action in OmniFocus, and choose 'Open URL' to open the original message very easily in Mail.

Hope that makes sense…