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This. I love eReaders for novels and the like, but for the "Six reference books out on my desk" work, paper is still king for me.

I think you might want to try more, bigger monitors.

I have a 15" MacBook, a 30" Asus and a 27" Dell. I often have multiple PDFs open along with an IDE and don't miss physical reference books anymore.

I've got two 27" monitors, plus the display on my laptop.

Still prefer physical reference books.

Depending on which workstation I'm using, I've got anywhere from 6880x1440 to 7680x1440 worth of pixels in front of me.

Still prefer physical reference books.

Note that I'm not referring to API or library documentation; that's a different sort of thing.