Hehe Well what you are asking is possible!
The third example, uses sessions and forms. So the form is validated, and the uploaded files are placed in a session object. (i'll show some code later on tonight). There is an event called "queueCompleted", so in that event you could say: "Finished uploading, processing thumbnails" and do an Ajax call to the backend which generates the thumbnails. That should do the trick for you. -- Gilles