Infolinks - If you have a website or blog that has good content on any specific topic then you can get your site or blog registered with Infolinks. They provide in-text advertising to their members. You must have seen content text links to different sites in different article directories; they are nothing but in-text advertising. It is a great source of earning money online.
Build a Niche Store - It is another simple yet powerful tool to make some quick money online. It provides an opportunity to create content based online stores and make money with eBay affiliate program. It is very simple and people are earning a lot from it.
Adbrite - With Adbrite you can sell some vacant space on your website or blog for text advertisement and earn good money from this deal.
Amazon Affiliate Program - Being an Amazon affiliate marketer you may either send direct visitors to the Amazon or create a shopping section or a store on your site or blog and easily earn money online. In any case Amazon takes care of your visitors and provides high conversion rate and great commission.
Amazon Seller - If you are creative enough to manufacture any specific item which has great demand in the present market then you can easily become Amazon seller and start selling your items online to earn more profits out of them.
Yahoo! Merchant Solutions - If you want to create an online store and sell your products or services then you can always trust on Yahoo! Merchant Solutions. They provide good services at low investment.
Azoogleads - It is similar to Adbrite. Provide some space of your website or blog for Azoogleads advertisers and earn money. Azoogleads has a good number of well known advertisers which provide great opportunity to earn good money.
BidVertiser - It is another great source to earn money and know the real value of your website's advertisement section. Place ads through BidVertiser and earn money with PPC program. You will always see the highest bid for your website advertisement space which gives you an opportunity to earn big.
Blog - Apart from creating websites and earning money through different online sources, you have always a chance to create your own blog based on your interest, update it regularly, plan and place good ads, and earn steady money for long time.
Commission Junction - It is another world renowned affiliate program site which provides great opportunity to all website and blog owners to come and join for free. Once you are registered with Commission Junction, you can choose from the thousand merchants and display their ads on your website. Based on different performances and terms laid down by merchants, publishers get a good chance of earning money online.