yes, bruce. i was just now going to add this...transparent backgrounds, either as png or as a psd. i like the possibilities in artistic renderworks, shaded polygons, etc. but, there isn't much flexibility in combining effects. if rendered views could be exported with transparent backgrounds, separate images (say sketch outline, shades surfaces, shadows...) could be layered in an imaging or painting program, then finished.
i am not a fan of the phoney realism that many rendering programs, including renderworks, are focusing on. more flexibility in composing visual representation is something i badly need.
cheers,
ray