I hate it when I read an article online that is recommending a product (like a book or software) that links to buy that particular product with an affiliate link.

I don't have anything against a writer making a few bucks from their website (I do it myself all the time). But when you are reading someone's endorcement for something, you spend ten minutes reading an article about how something is the greatest thing since sliced bread, you're convinced that you have to have this product, and they link to it with an affiliate link, then you're not sure if the product is really that good, of if the writer is just a good huckster.

So, whenever I write something endorsing a product, and then link to that product, I usually put the words "not affiliate links" next to the link to make it as clear as possible that I mean what I'm recommending and not taking money from sharing the information with others.