Make money, betting without risk, using a technique called arbitrage. Their guide book will teach you how to identify opportunities, where to find them and how to structure your bets. They also provide a "BetAlerts®" service, where they will send you details of arbitrage opportunities they discover.
Online arbitrage calculator for risk-free backing and laying on the exchanges. Incorporates commission rates and different criteria (back bet, lay bet or total stake). Their site also has other useful betting tools.