Today we received more information about Snow Leopard. The list of enhancements is pretty impressive. I'll be looking forward to September. Enhancements that I find the most intriguing are as follows.

AirPort menu signal strength.
The AirPort item in the menu bar now includes signal strength for all available wireless networks, so you can see which access point has the best signal before selecting it.

More efficient file sharing.
With Snow Leopard and a compatible AirPort Extreme or Time Capsule base station, a computer that acts as a file or media server can go to sleep yet continue to share its files with other computers and devices, saving energy. Learn more about energy efficiency and the Mac.

More synchronization options.
Now everyone, not just iPhone users, can synchronize their contacts through MobileMe, Yahoo!, and Google.

Removable sidebar headers.
If you remove the items under the Devices, Places, or Search For header in the sidebar, the header will disappear, too. To add it back, simply drag an item into the sidebar.

Intelligent text selection.
Advanced artificial intelligence analyzes each PDF document to understand the structure of its words, paragraphs, columns, and visual layout and create a map of the document’s organization. Preview uses this information to help you accurately target the text you want to copy and paste, even if the text is in columns.

Text substitution.
In Mail and TextEdit, text substitution lets you create shortcuts for phrases you use frequently that will expand automatically as you type. Common substitutions are built in — for example, changing (c) to a copyright symbol (©) and fractions from 1/2 to ½. You can also add your own substitutions; for example, “pnc” can expand to “privileged and confidential,” and your initials can expand to your full name.

Automatic setup in iCal.
iCal sets up your Gmail and Yahoo! calendars automatically. Just type in your address and password, and iCal configures your calendars.