I've decided to start looking at this too.
I want what everyone wants: The ability
to create thumbnails and such from a source
file, without having to save resulting files
to disk and delete them later. This seems
easy to do with a Handler. However, this
begs the question, can I access the Handler
without going outside the Image control
I create. This makes the control  self-
contained and doesn't necessitate
all this config stuff, or perhaps a config
file within the control could do the job.
Hey, here are a couple of files  I got on
the web that show another example.