Let me share this with you and I think it will help you to understand your Rights and Limitations as blogger. Blogging which up to now seems to be uncontrolled free medium of expressing views is now to be regulated by the FTC [ Federal Trade Commission]
The Federal Trade Commission will try to regulate blogging for the first time, requiring writers on the Web to clearly disclose any freebies or payments they get from companies for reviewing their products.
The FTC approves the final Web guidelines, which had been expected. Violating the rules, which take effect Dec. 1, 2009 could bring fines up to $11,000 per violation. Bloggers or advertisers also could face injunctions and be ordered to reimburse consumers for financial losses stemming from inappropriate product reviews.
FTC recently crake down fake blogs and to me it seems they want more fair reviews of products and services which means paid reviews are not a better option for bloggers now.
Read this article here for better understanding of the new law and how they will affect you.