What products or services do you find so interesting and worthwhile that you'd blog about them, suggest them to friends etc, even without a commission? One of the best ways to make affiliate sales is to write reviews where our honest and sincere enthusiasm shines through. Obviously, this requires us to actually love the product or service. Thus, perhaps one of the most important steps we can take is to find merchants we are enthusiastic about. Who and what gets you excited?
Basically anything that I think is worth my time. Even if its the best new wireless mouse. Or even a website such as digg or twitter.