Chrome competition is good. Changes made to webkit from google, say support for HTML5 components, will wind up in Safari. It's not so much an apple get on the ball and support HTML5, it's get on the ball and keep up with webkit enhancements. Also google has more of an interest in pushing chrome, because it gets people onto their core services, which is ads.
And part of the reason Chrome is kicking Safari a$$, is because Google actually cares about a stable browser on Windows. Anyone try to use Safari for Windows? That's right, it's buggy as hell.