This morning Google announced that they will be releasing an open source browser to tomorrow called Google Chrome. It will be using the same web kit engine used in Safari but it will have a new java script engine called V8.
They say its built from scratch so it will be better able to cope with the current generations of web applications and sites.
I think it will be interesting to watch.
They are using the webkit which safari browser is also using. And the speed with safari is very good so the new Google browser will also be very fast.