TotalSpaces is a few days from 1.0 release, beta testing 0.9.9 now between Lion and Mountain Lion. It is FANTASTIC! Works exactly as Spaces did prior to Lion. Some screen shots attached. I use dual displays, support for dual displays is coming in the 1.0 release as well as other features. It's free now, will be $12 for a license. I'm in no way affiliated with the developer, whose original ReSpaceApp was recently bought by BinaryAge, makers of TotalFinder. Kudos to Stephen! TotalSpaces Define your grid: Navigate left, right, up and down between your desktops. Manage your desktops: Display an overview of desktops and drag windows between them. Choose your transitions: Fully customizable transitions and hotkeys. Swipe between desktops: Moving around your grid has never been easier Hotcorners: Trigger the overview grid just by moving your mouse. App assignments: Keep your apps where you want them. Assign apps to desktops.