February 24th, Apple has released the new vision of web browser "Safari" the fastest web browser in the world. Safari 4.0 Beta, this beta still in developing and hope it will come out in full vision soon. Now you can download and try from directly website
https://swdlp.apple.com/cgi-bin/WebObjects/...2w9VgGGBPjw/2.5

This vision has a powerful faster load, wait less browse more with New Nitro Engine

Using the new Nitro Engine, for example, Safari executes JavaScript up to 30 times faster than Internet Explorer 7 and more than 3 times faster than Firefox 3 based on performance in leading industry benchmark tests: iBench and SunSpider.

for more information, refer to upper link as shown.

*source: http://www.apple.com