TotalSpaces is a desktop manager that brings back grid Spaces to OS X and more!

• Define your grid - and navigate left, right, up and down between your desktops
• Choose your transitions - Cube, slide and other effects, or turn them off altogether to really speed up your Mac
• Manage your desktops and windows from the Overview Grid - a birds-eye view of your grid
• Hotkeys, hot-corners, circulation options and more