From the reviews: -This is a self-contained and well written friendly guide to how to use the Internet for doing mathematics. It starts with a basic description of how to connect to the Internet and to use its tremendous amount of sources and then discusses some possibilities of producing mathematical material for learning and teaching, including some kind of 'ranking' of existing sites. ... This small booklet will certainly be useful for mathematicians, computer specialists, researchers in physics and life sciences, and interested laymen in Italy.- (Jurgen Appell, Zentralblatt MATH, Vol. 1115 (17), 2007)