Inside Mac OS X 10.7 Lion: New Dock, Finder & Desktop
Full Screen Apps
Additionally, Apple has added Full Screen controls to content-oriented apps such as Mail, Safari, iPhoto, and iCal which effectively turn their single window into a full screen app reminiscent of the iPad. When an app goes full screen, it creates a private space for itself rather than simply obscuring other windows. This allows the user to take specific apps full screen and then easily switch between them, the Desktop, Dashboard, and other defined Spaces using intuitive gestures.
In Lion, apps lose the upper right pill icon, with many now getting a Full Screen button that takes the window and turns it into a fully utilized private space. This also trims away the window's title bar and close buttons, erasing all the windowing chrome to present just the app's functions with as broad of an open canvas as possible. To jump out of Full Screen, the user can mouse up to display the hidden Menu Bar, where a new Full Screen button in the top right returns the app into its normal window view. Or alternatively, the use can swipe between full screen apps, Dashboard, the Desktop and other Spaces via gestures.
Integrating Full Screen Apps, Spaces, Dashboard and Exposé, Mission Control is a welcomed point of Singularity that builds upon ideas that have been evolving within Mac OS X over the past decade, and within the iOS, iPhone and iPad over the last few years, finally delivering a cohesive, intuitively familiar way for non-technical users to handle several desktops of active content without getting lost looking for key commands, keyboard shortcuts, or mousing around through menus.
On page 4 of 4: Launchpad, Finder icon dragging.