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In line with yesterday's brief announcement that OS X Mountain Lion would debut today, Apple has officially launched its next-generation Mac operating system to the public. OS X Mountain Lion [Mac App Store] is priced at $19.99 and is available exclusively through the Mac App Store

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OS X Mountain Lion brings a number of new features and enhancements to the Mac, including improved iCloud integration with support for Notes and Reminders, iMessage support via the new Messages application, Notification Center, Power Nap updating during sleep, Dictation, enhanced sharing tools, Game Center, improved security with Gatekeeper, and more.

Notification Center Now on Macs

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iMessage Now on Macs

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Siri Voice Dictation Now on Macs

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Power Nap that keeps your Mac up to date while it sleeps by downloading important system updates, email messages, updating your personal data via iCloud and more.

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OS X Mountain Lion has well over 200 new stuff.

Apple highlighted the following features in the press release.

• iCloud integration, for easy set up of your Mail, Contacts, Calendar, Messages, Reminders and Notes, and keeping everything, including iWork® documents, up to date across all your devices;
• the all new Messages app, which replaces iChat® and brings iMessage™ to the Mac, so you can send messages to anyone with an iPhone®, iPad®, iPod touch® or another Mac;
• Notification Center, which streamlines the presentation of notifications and provides easy access to alerts from Mail, Calendar, Messages, Reminders, system updates and third party apps;
• system-wide Sharing, to make it easy to share links, photos, videos and other files quickly without having to switch to another app, and you just need to sign in once to use third-party services like Facebook, Twitter, Flickr and Vimeo;
• Facebook integration, so you can post photos, links and comments with locations right from your apps, automatically add your Facebook friends to your Contacts, and even update your Facebook status from within Notification Center;
• Dictation, which allows you to dictate text anywhere you can type, whether you’re using an app from Apple or a third party developer;
• AirPlay Mirroring, an easy way to wirelessly send an up-to-1080p secure stream of what’s on your Mac to an HDTV using Apple TV®, or send audio to a receiver or speakers that use AirPlay; and
• Game Center, which brings the popular social gaming network from iOS to the Mac so you can enjoy live, multiplayer games with friends whether they’re on a Mac, iPhone, iPad or iPod touch.