• ClicknWork - Get paid $5-$150 per hour for basically doing freelance work on a per-assignment basis. You have to pass a pretty tough test to get in.

• Clicksor - These are the guys that generate contextual ads on sites that show up when you hover over a double-underlined word.

• Commission Junction - If you have a site, you can join Commission Junction. Once enrolled for free, you can choose companies whose ads are pertinent to your site. Companies have the ultimate say on working with you. Their are easily over 1,000 companies to choose from here.

• CreamAid - For blogs only, advertisers provide you with a topic and you write about it on your site. To do this, you have to install a flash widget into your blog post. The more people you bring into the conversation through the widget, the more you get paid. It's difficult to explain.

• eefoof - Think of it as YouTube + Flickr + Music. You add original content and they pay you based on the visitors you attract.

• Ether - If you are an expert on something, Ether provides a way for people to pay you to talk about it in a one-on-one setting. If you want to charge $250/hr, that's fine. You have to do all the advertising so you should have a blog or site already established.

• eBay - Come on, you know what this is.

• eBay Stores - If you have a real store and want to sell your stuff online, this is a decent option to get you started.

• ELance - Name gives it away. Programmers, Codes, Web Designers, Writers, Editors, can look for freelance opportunities.

• Feedvertising - This is an arm of Text Link Ads and is currently only good for Wordpress 2.0 Users. This does me no good currently, but as you can guess, they place ads in your feed(s).

• Feedburner - Not only are they the best place to house your feeds, they will also add ads to your feed. You get paid per impression and click.

• Google Adsense - Come on, you don't need an explanation. These ads are all over the place. Google displays relevant ads based on your site's content

• Google Adwords - Create simple text ads and choose keywords that determine when they are displayed. This is where the Adsense Content comes from. You do not need a site for this.

• Google Answers - If you are good, Google will pay you to answer questions in your specialty. Questions all come from normal people like you and me. You can get paid $2.50+ per answer you provide.

• H3.com - Get paid to fill jobs. Commissions range from $50-$5,000. It all depends on how tough the job is to fill and how desperate the hiring company is. This is another one that's tough to explain.
• Indeed.com - Add their job board to your site. They then post jobs based on the geographic location of visitors and the position types you pre-select. I tried it and I they continually report that I sent 0 visitors and I know that's not right. Nevertheless, I may have an isolated problem so they make the list.