eBooks for business can easily be sold on clickbank if you have a site and sales page. There are many things one does to market these, but affiliates is really the way to go. That is if you are actually selling it and not just trying to give it away.
A great site for lower priced products is payspree (see link in my signature) This works a bit like the $7 dollar secrets script but is web-based so very easy to use and bug free. when a sale is made by an affiliate, you get paid instantly into your Paypal account. Also, the affiliate gets paid instantly too. The site takes only a very small fee from each sale. Very nice system.