Robert P. Goldman wrote:

> If you've gotta carry gifs or jpegs of your manual pages, your PDA
> isn't a whole lot of help.  Plus looking things up without text search
> makes binders actually more efficient (I can speak to this issue from
> personal experience, having downloaded manuals for some of my
> obsolete computer hardware!)

Also, your printed manual isn't going to lose battery power or get 
nailed by a small EM flux and need a hard reset during, say, emergency 
repairs or landing preparations. :)