6. Share Sheets
Mountain Lion-enabled apps get Share Sheets. Press the share button from within the app and you get a menu (a "sheet") of services for sharing links, pictures, videos, etc. At the preview stage, we saw links for AirDrop (to share directly to Macs on your network), email, Flickr, Message, Twitter, and Vimeo. (Facebook isn't available in the initial release of Mountain Lion, but word is it's coming soon.) The share button is baked in throughout the system: Safari is a no-brainer, but it's a little cooler to find out that anything you can preview or QuickLook can pop up a Share Sheet. There's a developer API for Share Sheets, too, so third-party apps can also get in on the sharing action. Twitter gets special mention. Click Twitter on a Share Sheet and you get a "Tweet Sheet" that contains whatever it is you're tweeting about: link, picture, etc, with the usual character countdown. Once you've got Twitter set up, it gets added to the Notification Center, by default.
7. Reminders Reach the Mac
The Reminders app you know from iOS—the same one that works with Siri on iPhone 4S and has geo-location reminder abilities – is now available for your Apple desktop. This simple organizational app keeps you on track with lists, due dates, and sorting by date. Apple iCloud can keep it synced across all your devices, and it also works with CalDAV services, such as Google Calendar and Yahoo Calendar (though you can keep local-only reminder lists, too).8. Take Note of Notes
Mountain Lion takes another page from iOS and pulls Notes out of email, promoting it to its own app. Notes can be fairly rich, content-wise; you can drag and drop photos and attachments to Notes and format them with bullets, fonts, numbered lists, and so on. You can pin Notes to your desktop with a double click, and the Share button makes it easy to send them to collaborators. Finally, with iCloud, all your Notes are synced across all your Macs and iOS devices.9. Gatekeeper Keeps Mountain Lion Safe
Mountain Lion beefs up security with Gatekeeper, a powerful line of defense against future threats. Gatekeeper prevents malware by only running apps it deems safe because (at Gatekeeper's most restrictive setting) you downloaded them from the Mac App Store, or (by default) because they were downloaded from the App Store or written by licensed Apple developers and contain digital signatures that are destroyed if hackers modify the code. There is a third setting you can choose, too, that will let you run apps downloaded from anywhere. Apple will provide digital signatures to every registered developer for inclusion in their software, so by the time Mountain Lion ships, most safe apps should be signed.
10. One More Thing: China
Apple has a chance to get some positive China-related coverage for a change with its OS X 10.8 Mountain Lion one more thing: A big push for improved Chinese localization. And why not? It's a huge market, and Apple CEO Tim Cook revealed earlier this year that Mac adoption in China doubled last year versus 2010. New features include improved text input, for example, with better suggestions for Chinese characters, and typing for English and Chinese characters without toggling between the two for more convenient input of names or words without Chinese equivalents. Apple also promises to more than double the number of Chinese characters supported in handwriting recognition, auto-correction, and improved text input for those who type Pinyin with regional pronunciations. Apple also gives a nod to local services: Users will also be able to set up Mail, Contacts, and Calendar with services like QQ, 126, and 163. Also planned is Baidu search in Safari, as well as access to Chinese social-network site Sina weibo and video sites Youku and Tudou via share sheets.