"Anyone who aspires to bit-twiddling must check out http://hackersdelight.org/ http://hackersdelight.org/HDcode.htm ... It's an outstanding collection of algorithms ranging from obfuscated bit twiddling to classical multiplication." -- recommended by Scott Dattalo
"I will add my endorsement of this book it is a great easy read of serious neat algorithms around number systems, math and just fun stuff." -- recommended by Walter Banks