Turning on/off from Space Preference pane every time can be very painful for most of us.
Here is the applescript i am using. This is my first script and i think that i am going to like applescript a lot.
if (do shell script "defaults read com.apple.dock workspaces") is equal to "1" then
do shell script "defaults write com.apple.dock workspaces -bool no;killall Dock"
say "Space turned off"
else
do shell script "defaults write com.apple.dock workspaces -bool yes;killall Dock"
say "Space turned on"
end if
You can use Script Editor to use the script above or you can download little app i made for myself with growl notification and voice prompt.
Download Space Toggler here