There is actually a very easy way to make some extra money on the internet. Market research companies will pay you to answer surveys, respond to emails and comment on advertising. All you do is join and fill out some demographic information and the surveys start rolling into your inbox. You can respond to as many or as few as you like.
There are so many of these market research companies. I have even seen lists and databases with over 700 web sites in them. My experience is that if you join some of these you will never see a survey, let alone a payout.
So the question is, which ones are the best to join?