Backers that support a project on Kickstarter get an inside look at the creative process, and help that project come to life. They also get to choose from a variety of unique rewards offered by the project creator. Rewards vary from project to project, but often include a copy of what is being produced (CD, DVD, book, etc.) or an experience unique to the project.
Project creators keep 100% ownership of their work, and Kickstarter cannot be used to offer equity, financial returns, or to solicit loans.