3. Automatic location detection
When you travel, it's easy to get mixed up as to when your appointments are, since your computer is still in your "home" time zone, and you have to mentally calculate the current time when looking at the calendar or clock. Sure, you can change the time zone in the Date & Time system preference, but it's easy to forget. So Snow Leopard changes the time zone for you automatically (if you set that as the default behavior), using Wi-Fi mapping to figure out where you are -- you will need to be connected to a Wi-Fi access point or router. iCal can also be set to adjust the times to the current time zone automatically, so your calendar always reflects the current times.
4. The new Preview is more like Adobe Reader
I have nothing against Adobe Reader, but I love that Preview now can open multiple PDF documents, display their contents as contact sheets, and show thumbnails of pages in a sidebar for easy navigation. In other words, it works a lot like Adobe Reader. That's one fewer app to launch -- and since Preview loads much faster than Reader, I can get to my PDFs' contents much faster now.
[ Get all the details on the new Mac OS X in the "Snow Leopard Bible," by InfoWorld's Galen Gruman and Macworld U.K.'s Mark Hattersley. ]
5. Movie and screencast recording
Snow Leopard takes the formerly $35 QuickTime Pro and makes it a standard, free app in Mac OS X. That means you can record movies and -- great for many marketing, education, and Web professionals -- screencasts from your Mac with no additional software.
6. Systemwide automatic text replacement
Automatic text substitution as you type is nothing new; Microsoft Word has had it for more than a decade. But Snow Leopard lets you specify such substitutions via the Keyboard system preference, so you have a common set of substitutions available to all applications. Right now, only TextEdit, Mail, and various Apple apps use this common auto-text service, but if other software developers adopt it, you may finally get all your text-oriented apps to autocorrect the same way.
7. No more gesture segregation
I have a late-2006 model MacBook Pro at home, and it's frustrating that its gesture-capable trackpad supports only the first generation of touch gestures (one- and two-finger moves), not the second-generation three- and four-finger options. Snow Leopard fixes that, so gesture-capable trackpads now support all gestures, no matter what Mac model you have. (Of course, your Mac has to have a gesture-capable trackpad, so models before 2006 aren't helped out by this update.)
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