auto-save-desktop?

[Steve Wainstead]

Does anyone know of an extension (or an existing way in Emacs that I 
missed) to automatically save the desktop? I'd like Emacs to do 
desktop-save to a user-specified file periodically; I lost my X session 
yesterday and had several open files.

It's a matter of having to hunt for all those files again and find the 
places where I was. An auto-save-desktop feature would save me a lot of 
time when this happens.

~swain