Roland,
I’m working on something similar right now for the entire WP-backend… we should compare notes sometime…
Since an entry can be in more than one category, a list makes sense. It can be styled to appear to be a single line.
But if you REALLY want a line instead of a list, use the separator parameter. See the wiki: http://wiki.wordpress.org/index.php/TemplateTags#Categoryx20.tags
Shouldn’t that be ” GROUP BY cat_ID ” ?
Does this help? (Specifically, the count parameter.)
http://wiki.wordpress.org/index.php/TemplateTags#get_archives
To keep all defaults except showing count, it would be
<?php get_archives(”, ”, ”, ”, ”, TRUE); ?>