Win - Tab for the overview, you can then add virtual desktops in the top row. switching between them with Ctrl-Win-L/R-Arrow.
Works the same on the current KDE :-)
I have bound the switching to modifierkey (on the mouse)-Mousewheel L/R, so i can switch desktops with the mouse only :-)
Now if Windows and KDE would just remember which programs belong on which desktop, that would be nice.