Room design

Hi there,
I’m new to flash and want to create a room design application.

Say that I overcome my object design issues, I need to know how to save the user’s final design.
This of course means that when the user comes back to the site, he has the room designed from the last saved state.

What is the accepted format of accomplishing this ? Saving the data on a special DB and have the AS read that on load ? a cookie (I doubt that …) ?

Thanks a lot !