Alternative
Google predicts that only display advertising is going to be a $200 billion-dollar business within the next few years. If you have a personal or business blog/website, you may try to use Google Adsense to put ads in your site to make some bucks. However, we have seen that Google's terms and conditions are very strict and as a result many publishers cannot use Google Adsense in their sites. Most of the times they are denied from using ad sense. Alternative -two of my favorite sites are http://chitika.com/ , an online advertising network & http://www.bidvertiser.com which I found to be quite useful. The good thing is that their terms and conditons are pretty loose. Thanks.
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Rituraj