Apple launched a beta version for Safari 3 for both Mac and Windows XP/Vista. Apple claims that Safari is "the fastest, easiest-to-use web browser in the world" and that it loads pages two times faster than Internet Explorer. Because Safari has a Mac interface it's hard to argue that the browser is easy to use for a Windows user. This beta version is not very stable, so you may experience frequent crashes.
For a browser that claims to be the most innovative in the world, Safari doesn't bring too many new features: private browsing that lets you pause the web history, resizable text fields, clever inline find, progress bar included in the address field.
I also don't understand how a company that promotes elegance and simplicity tries to install QuickTime with all their software and bundles Bonjour, a service that detects shared devices on your local network, with a browser.
But the most important thing is that web developers can test their sites in Safari without buying a Mac or using a service like Browsrcamp and more sites will support Safari.