Well, apparently Espresso has none of CSSEdit’s features… I don’t know what that developer is thinking…
I’m hearing that Panic’s Coda is really good, but I don’t really want to drop $100 on it just to use the CSS tools. Also, I know that if I buy Coda, I’m going to want to make a Tumblr plugin for it… and I have a feeling that it wouldn’t be as simple as making the bundle for TextMate…
There is an app called Stylizer that seems to be similar to CSSEdit, but for Windows. They’re going to release a Mac version sometime soon, so that might be the solution… I just wish MacRabbit would update CSSEdit and provide official support for CSS3 (Yes, I know about the hack).