TaskLayout is a portable utility which allows saving/restoring of the desktop layout (a set of specified apps/windows with corresponding screen positions) in a single click/hotkey.

You can revert the changes made on the desktop (actually, restore the saved layout over the others) in a single click or hotkey and get these windows back to their original positions.

TaskLayout Features:

save active desktop layout(list of running applications, corresponding window positions, etc)
specify any custom commands as a part of layout(e.g. "mailto:1@1.com", sleep windows, etc)
use commands library to select command from a set of standard ones
import BAT files/Windows shortcuts for fast migration
explore visible windows with Finder tool(retrieve command line and other properties)
assign hotkeys to restore/close layout
autorun for periodic actions(e.g. lock Windows every 1 hour to have a break)
sequential application startup for slow computers when restoring layout
check updates from website
TaskLayout requires no installation