I'd prefer dividing into 2 or more books to putting it all on cd.
Pretty much the only reason is that a book will last a long time, while a CD is only good till the technology changes.
Remember- Paper tape, magnetic tape, 8"floppy disc, 5 1/4 " floppy disc, 3.5" disc,....And CD is on its way out as well. Sure, the current DVD drives are backward compatible, but the next generation of media almost certainly won't be. So if the book ever stops being published, and there's no migration to new media, figure at most a decade before ALL the information in the book is lost.
I also find online or CD references to be very clumsy. Most aren't well indexed.
And switching back and forth between windows to find info about an item can be a bigger pain than just having the book open on my lap as I browse online. It's also pretty hard for some tasks to keep dragging the cards down to the computer from the room I keep them in.
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