The very much expected Snow Leopard OS version for Mac was talked about today at WWDC and the new features in it seem to be great and show a lot of tweaks.

The Snow Leopard was actually launched and just a developer preview version is available right now. But the pricing is already announced.

• Stacks handle lots of content better — scrolling, drilling into folders. Finder lets you magnify thumbnails on the fly, similar to iPhoto. Can step through multi-page documents and play videos right through Finder. (Taken from Macrumorslive)
• Expose: Click on any App icon and all the windows of the app would be exposed. Better organization of windows in expose.
• Can drag a file to an icon in the Dock, all of the app’s windows will appear, and can drop the file in the correct window.

Snow Leopard is launched for Mac OS leopard and previous version users. Leopard users can upgrade just for $29 and family pack for $49 which would be released in September. Snow would be available for all intel macs. The upgrade from Tiger to Leopard still costs $129 for people who did not do that already.

The features and screenshots of Snow Leopard that were shared earlier were mostly true and not much rumored, and actually more features are included in the snow leopard.
So, Mac users get ready to become more geeky! Apple iPhone 3GS, Safari 4 and iPhone 3.0 OS are also released today at WWDC.