As I start to harness the true power of the Joomla 1.5 framework and template over-rides I'm finding that you can really do anything imaginable. As I was working on the new site for Zuno Studios I wanted to add special CSS styling to the last menu item in my menus.
This was really easy. All it takes are some changes to the mod_mainmenu module. Mod_mainmenu is the core Joomla! module that controls the output of your menus. I created a template over-ride for the mod_mainmenu module in order to keep the J! core untouched. This is key to easily updating your J! core.