I just saw Panic put out
Coda
for mac os. It's an all-in-one web design app that lets you edit raw code, edit css in a nice interface, ssh terminal access to your server, transmit ftp to automatically sync files, and some reference books. This might be worth the $75 it costs. I loaded a Joomla site I'm working on that's local and it previews it just fine. It makes it easy for a css noob like me to modify the template. All it needs is some of the tools built into the Firefox web developer toolbar (viewing css info with the crosshairs is what I use the most). Thought some of you might be able to use this.
Edit: Whoa! I didn't look long enough. It has a DOM inspector which is similar to what I need. Very slick software.