Added some code to the AppleScript and a ‘Post Notification’ step to Dan's great workflow so it now triggers a notification in the Notification Center with the task name that the new OmniFocus task was created. I have set it up with 'command-N' as the Hotkey.
You can download the updated workflow here:
https://dl.dropboxusercontent.com/u/6967006/New%20OmniFocus%20Inbox%20Task%20with%20Notification.alfredworkflow