Promote your podcast by contacting the people and or companies you mention in your show. Many times those people will respond by passing on your content to their community.
Whether it’s through a simple tweet or facebook post, your content gets exposed to infinite amounts of new listeners when it’s passed on by someone else. And typically when you are mentioning someone or something on your podcast, it’s something you are a fan of, use, or plan to buy. Therefore the person who you are most likely speaking kindly about or the product which you use and love is great promotion for them or their company.
In most cases when you let someone know that you are talking highly about them or their product, they have every motivation to pass that on to their community. You see it on the backs of books and website testimonials, people like it when you talk about them and their products.
So let them pay you back with a retweet, a facebook wall post, or maybe even a mention on their own show. Market your show and get your podcast in front of hundreds of new listeners just by making someone else aware that you talked about them.