The PDA portal is pretty solid now and eliminates all portal generated frames. Angel advertises its 508 and PDA portal on virtually every page (screen shot attached).
I think that we should do the same - but instead place it as one of the links at the bottom of the gateway page default out of the box for 2.8.
In a sense, our PDA portal is both a PDA portal and a better user experience for 508 folks so we would not have two buttons - but then we need a way to describe it accurately. Do we call it PDA/508 view? If you go to the PDA portal - you see a "switch back to classic link at the bottom of the screen - which is very cool as the UX switching back and forth should be pretty cool.