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.
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.