The Finder has been completely rewritten to take advantage of the new technologies in Snow Leopard. The familiar Finder interface is unchanged, but you'll discover that the Finder is faster and more responsive. It also includes an enhanced icon view with live file previews, so you can thumb through a multipage document or even watch a QuickTime movie.
New core technologies.

New core technologies in Snow Leopard unleash the power of today's advanced hardware and prepare Mac OS X for future innovation.
QuickTime X.

The next-generation media technology, QuickTime X powers the audio and video experience in Snow Leopard. It debuts a completely new QuickTime Player application with a clean, uncluttered interface as well as an easy way to record, trim, and share your media.

Out-of-the-box support for Microsoft Exchange.

Snow Leopard includes out-of-the-box support for Microsoft Exchange Server 2007 in Mail, iCal, and Address Book, so its easier than ever to take your Mac to work.
Safari 4.

The latest version of the blazing-fast web browser delivers up to 50 percent faster JavaScript performance and is more resistant to crashes than ever.
Universal Access.

Every Mac comes standard with a wide range of assistive—or Universal Access—technologies that help people with disabilities experience what the Mac has to offer. Snow Leopard continues this support with a variety of innovative features that advance accessibility even further.