As an entrepreneur (or someone looking to get involved!) there are many courses open to you for professional development. Here are a couple of sites which we like, some offering a range of topics, and others more specific:
Online Learning Sites for Entrepreneurs
Coursera: Take the world's best courses, online, for free. (Filtered for courses related to entrepreneurship)
We offer a diverse selection of courses from leading universities and cultural institutions from around the world. (Filtered for business courses).
MIT OCW is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
Open2Study provides free, specialised short courses, entirely online, across the world, in a range of subject areas.