Although there are many scams all over internet, till there are real opportunity to make money free online from blog. You just have to find out the real opportunities. If you have one website or blog then two basic online earning opportunities are
1. Earn from advertise
2. Earn by Selling affiliate products

Make money free online from advertise and affiliate programs

It is a big earning opportunity from blog or website if you have large volume of visitor. A well known program is Google Adsense and other that I trust is Bidvertiser.
They pay you every valid clicks that come from your website. If your website is well known then you may get calls from company that interested for advertise in your website.

Another free earning opportunity from blog is by selling ads on your blog. If your blog has good volume of traffic then it is a good blog earning opportunity. Text Link Ads is one of the good site for sell ads.

There are different payment schemes available for different affiliate programs.
1.Pay Per Click (PPC)

In this scheme you will get paid when visitors clicks on the banner of the advertiser. If your website has high traffic then you can earn large buck from PPC. PPC is the main earning scheme for most of high traffic website. Another important factor for earn more from PPC is placement of banner, if you place banner in attractive place of your web page then you will get more clicks so more money.

2. Pay Per Impression (CPM)

In this scheme you will get paid according to the number of times the advertiser banner displayed on your website. The earning amount is calculated in the number of thousand impression of the banner. Here impression means the number of times banner is displayed. So every time visitors load the page you will earn. If your website has high traffic then CPM also good earning opportunity.

3. Pay Per Lead

In this scheme you can earn money only when visitors complete one sign up from or complete their offer or like that other than purchase. The earning commission is better than PPC in this scheme but less than pay per sale, where you get commission when you make sell. Linkshare is one of the best pay per lead program. If you select some advertiser that suite to your website topic then you will get much better result.

4. Pay Per Sell

In this scheme you will get paid when you make sell. Conversion rate for this scheme is less than other scheme. Moreniche, Clickbak, Commission Junction, Shareasale are some reputated pay per sell affiliate programs. Some good techniques for getting better results are article marketing,forum marketing, product review etc. You may write some good article about the products and submit in article site and leave the affiliate link in resource box. You may review the products telling about how people will benefits from the products.

How you find out best affiliate programs

If you want to join some best affiliate programs then go to affilaite programs directory where you can choose some best affiliate programs. You can get some best affiliate programs at http://www.thefreecountry.com/webmaster/affiliate.shtml.

When join affiliate programs make sure that you choose programs according to your website targeted visitors rather than commission. Another point is try to find out 2 tier or 3 tier affiliate programs from which you can get lifetime commission. Always concentrate in a particular program or a particular product and try to promote them, rather than promote different programs, this will increase your conversion rate.