You can earn good amount of money by a variety of methods including
Doing simple tasks (like giving feedback about a website)
Getting cash back for shopping online
Playing games on their site.
Or even using their search engine
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Some companies are willing to pay you to do trial of their products. They know very well that many people who do the trial offer will like their product and become customers, so they are willing to pay people to sign up for trial offers.
So one of the best ways of making money is signing up for offers like a Free Netflix trial, emusic.com, applying for a Discover Card, etc. The key to success is having a calendar where you can keep track of when the trial periods end and make sure to cancel before they end.
If this suits you we can recommend Project Payday as they have a ton of training guides (free if you complete a couple offers) that will greatly simplify the process.