When I am being compensated specifically to mention a product or service, I will specifically disclose that in the blog post by indicating that it is an advertisement or sponsorship. When I link to places where you may buy a product or service (like Amazon.com, BarnesAndNoble.com, etc.), it is possible that I am participating in an affiliate program, from which I may receive commissions on sales. Merely mentioning a product or service does not mean that I recommend or endorse it. If I do recommend or endorse a product, I assure you I would recommend or endorse it even without compensation.