Could you elaborate a little more on what your looking for. Is this just for learning, does this apply to a site you have, Are you trying to learn how to market it better.
Well in that sense I recommend you to start with article, forum and email marketing. In brief - article marketing is done by submitting various articles in lots of directories describing your niche. - having signature about some key fact of your services you can do marketing on your product or service related discussion forums. - email is good only if you can make a huge email list from your niche related sites.