[xmonad] remember layout(s)?

[johannes at albapasser.de]

This must be a FAQ, but anyway ...

As much as I like the tiling and mouseless behaviour of xmonad,
the main obstacle in using it is that it does not seem to
remember the layout of the applications when I log out (from KDE)
and then log in again. There must be a way to achieve this?

I know I can write preferred locations for apps in config files,
but that's not what I want to do: it should remember exactly
the previous layout. (Or at least which app was on which screen.)

Best regards, J.W.