I do Google Adwords (profitable, but no great volume), SEO, advertorials (profitable, too), guest blog posting (meh), Twitter, APIs (MailChimp, GetResponse), small business coaches, white label solution for partners, partners in general (web directories, homepage builders).
Getting sign ups is a very slow process. Can be frustrating from time to time.
Getting sign ups is a very slow process. Can be frustrating from time to time.