– especially useful for category-specific themes, very useful when you want to simulate something like one installation, multiple blog of WordPress MU. – similar to previous link, but using a plugin. Have not checked to see if compatible with WP 2.5. – header image by category. – discussion on how to remove category_base in permalinks.

Using WordPress to run a magazine site

Nautica-magazine WordPress theme – a good example by the same author. – a list of good themes, mostly free. – another shorter list.