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.
[...] Violating the rules, which take effect Dec. 1, 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.
— From Bloggers Must Disclose Payments for Reviews at the New York Times (update: link no longer working, but you can read the same article here). Many thanks to Sondra for the link!