Just as Amazon changed the way we shop and Apple reinvented the music biz, digital disruption is going to soon affect every aspect of your money: how you earn it, save it, invest it and spend it.You'll want to keep close tabs on the 50 companies listed here. They are the small firms destined to have a big impact on your financial future and possibly upend your portfolio.Click here for the first list. More details on each company can be found here.