It's Coda sounds like soda

Today I seem to keep coming across a little application for OS X, called Coda. It's basically an HTML/CSS editor that show you changes as you code the site, it's sweet. I've only been able to play with it a little bit but I think this may become a must have for all of you old school guys who design by code and hate having to switch back and forth. Check out some screen shots at the developers page here.