AIS had a pretty awful clause in its contract. People complained to me, I passed on the complaints and within 24 hours AIS had removed the bad clause from its contract. So I wrote a little paragraph praising Thomas Harpointner of AIS and saying how it was great to see a company so responsive to the wishes of its associates. For the time spent, writing that little paragraph must be about the best thing I've ever done. It worked so well that I left it on my main page long after it was old news - and it kept on working, making sales.
Personal recommendations work well, too.
I know it's difficult if you're short of money, but take the plunge and actually buy the product you're selling, so that you can write from personal experience. I did that with Corey Rudl's marketing course and my sales soared - even though I said good and bad things about the course. At the moment I'm promoting a book by Declan Dunn and because I have a copy I can quote from it and make it clear that I've read it. I'm sure that's helping achieve sales. I get a lot of letters from people who assume that because I'm getting a bit of publicity I must be some kind of an expert.