i think somebody mentioned before when you're doing multiple books, you get into state, do the tangerine thing, then state a purpose for each book, eg state a purpose for 1st book, preview, PR. state a purpose for 2nd book, preview, Pr..etc. i bet tho that teh previews are proly kept to a minimum..just to get a general idea what you're gonna read about...
tha's my feeling about the whole thing. it seems tho that PRing a whole bunch of books really helps with stuff, gives you extra info, etc, even if you dont activate