Do you know Safari? Apple’s web browser for Mac OS. And now, it can be installed on Windows.
Nice UI, and similar shortcuts as Firefox (like Firefox in iTunes theme). Firefox now has more competitors on Windows (IE, Safari, Maxthon, Opera and so on).
For me, Firefox is a better one. And I surely will give Safari a try.
(Updated: If you are a Chinese like me, you will find it impossible to input Chinese with Google Pinyin. I do not try other input method because I love Google Pinyin. I have reported this to Apple. Wish they can find a solution soon. In this aspect, Firefox 3 Alpha (Gran Paradiso) plays much better.)