OS X 10.7.2 is now available to the public. This upgrade includes support for iCloud, so you can sync your email, calendars, contacts, and bookmarks with any Mac or iOS device.
Once you download and install OS X Lion 10.7.2, you'll be presented with the iCloud setup panel, which is also available as a new System Preferences pane. Once you set it up, you're ready to start using iCloud's various services.
Lion update information is available at:
As always, the updates are available from the Software Update item, located under the Apple menu.