Alternative ways to group results of a view by CCK field?
You can do almost anything you want within a views template.  If you look at the Theme Information in the View UI, you can see what you can modify, or just cd into modules/views/theme and take a peek at them.  But, given that the $view variable is available to almost if not all of the templates (whether or not the comments say it is), and $view->result is an array of row values of the view, you can certainly foreach() through it and do whatever you want.  Otherwise, you have the whole gamut of preprocess() hooks, views_pre_render() of which is probably most of interest here.