Displaying multiple user lists on one page

Hi!
I would like to be able to display multiple user lists on one page each list separated by the list title. Basically just "expand" the drop-down menu to show all lists.

I suspect I would need to modify the core php files, but could someone give me a direction in which to start?

Thanks!

I'm trying to do this too! Please help someone - surely this should be very simple factor to allow - a menu item to display all published lists no a single page under headings rather than having a pulldown menu.

Any developers interested? I'm sure there will be more people looking for something similar too!