The easy way to remember this is to click on your Category page, then add the word feed to the end.
Examples:
http://www.cybercoder.net/tips/blogging/feed – (Categories renamed to Tips)
http://www.musicramble.com/category/awards/feed/
Then go to Feedburner and Burn a New Feed using that URL.
hilj, look at the sidebar here and see if this is what you want.
CyberCoder.net
I put each post in one category ONLY, then list the Posts BY category, I think that is the same thing you want.
Here is the code I use.
<?php
global $post;
$myposts = get_posts('numberposts=7&category=8');
foreach($myposts as $post) :
?>
<li><a href=<?php the_permalink(); ?>><?php the_title(); ?></a></li>
<?php endforeach; ?>