I wrote a hub about this (http://casmerchant.hubpages.com/hub/Ways-to-earn-s... the 6 ways I, personally have earned money online. If you like selling products, craigs list is full of free stuff, so you could pick up some odds and ends and list them online. As far as survey sites go, I only bother with the 2 that I mentioned in the article because I get at least one check a month from each of them. Also read this hub(http://casmerchant.hubpages.com/hub/Earn-Big-Money... for information and a few links to online market research panels where the pay for one study is often $100 or more (the one I just finished paid me $75 for 3 days of online social blogging ). I'm sure if you searched "earn passive income" you'd find a lot more suggestions!