Automatically create preseed files after every install.

Hi,
The Ubuntu installer should automatically create a preseed file after every install so that people can easily automate their installations.
I know preseed files are somewhat supported on the alternative CD but from my experience, its hard to use and hard to create.
Also, The location of the preseed file should support thumb drives so that people don't have to re-burn their CD for each preseed file.

This should be an easy to use option on the graphical installer.

Dave.