Atiz introduced the world's first portable book scanner in February. The problem with that one is that it sells for $35,000.

Atiz has now introduced the Atiz BookDrive DIY, which sells for a more affordable $3,499, but still does scan 1,000 book pages per hour. You need to provide though one or two Canon digital SLR cameras to make it work. Currently this book scanner supports the Canon EOS 350D, 20D, 30D, 5D and 1D Mark II.
At $3,499, this book scanner is still not for home use.
More details on the Atiz site.