establishing rss per category

I’d like to place an rss feed outside of WP for each category inside WP.
i read this:
http://wordpress.org/support/6/3542
and i read this:
http://wiki.wordpress.org/index.php/One%20RSS%20Feed%20per%20Category
and i’m still stumped.
i’ve got an rss feed receiving fine via javascript on a test page.
but what i’d really like to do is send different categories to different places within my site.
also:
the javascript seems to only really take synopsys, or limited text.
i’d love to reproduce the entire category (or stated number of posts) elsewhere.
i tried rebuilding my template to house 4 categories posted individually.
the results were mixed, each a failure.
however i did manage to filter the categories ($cat=3)
but each duplicate loop was either a php error, or a duplicate of the first loop.
this seems like an issue that at least a fewpeople would like to solve
“displaying multiple categories on a single page:: unmixed”
i’m fine with sending or receiving if reconstruction of the index is not possible…
.. but how?
dss