I have been playing around with the Coda editor lately. Personally I think it's horribly overpriced for an editor with missing features such as variable and custom function completing and a cut down SVN tool which offers only the basics. I just can't see the point of the all-in-one approach. I have better tools for CSS editing, FTP, SVN, Website preview and Terminal usage.
Bad stuff aside though I'm very impressed with the editor and the overall design of the application, it has to be the nicest looking editor I have seen and that's the main attraction for my wanting to use it. It even has a nice syntax highlighting colour scheme. In fact its so nice I decided to create a TextMate theme so my editors match 
