RDoc Without Frames (A Concept)
John W. Long offered a mockup he did for a Class-per-page layout which uses IFRAMEs to avoid cluttering, but allow the same navigation. Though he hasn’t had time to work them out completely, he’s implemented the HTML and offered his work up for anyone to finish.
Update № 2: The templates do not use IFRAMEs. Those are DIVs = better browser support. John has also indicated that the templates are copyright-free, so everybody can settle down.