I have butchered a few of my books using the simplest method, a utility knife.
Blade must be razor sharp. Hack off the hard covers. Use a metal ruler thick enough to serve as a weight on the binding, wide enough so you don't cut your own fingers with the utility knife. Make as many passes along the glued line as it takes to separate the binding from the pages, cut away the freed binding as it peels back from the pages, remove pages in batches of several dozen as you progress & stack them in order, until you cut away the bottom page in the stack from the remains of the binding.
The cut edges tend not to be parallel/orthogonal with the other edges of the pages, this doesn't matter to me. The cut edges are incised and pretty clean. I don't rebind, just discard after scanning. Results are a pile of unbound pages, a sliced up binding and many thin strips of paper cut away by overlapping passes of the utility knife.
I have a cheaphttp://usa.canon.com/cusa/consumer/products/scanners/document_scanners/imageformula_p_150_portable_scanner
sheet fed scanner, the Canon P-150, which will accept a stack of about 20 pages at a time into its scanner.
It scans both sides at once & feeds the results to the Paperport doc filing program in a wide variety of formats. For books up to 200 pages, it is easier for me to simply stack the pages in the input rack a few at a time while the scanner is pulling pages from the bottom of the stack.