Try Gradual Engagement instead of a hasty sign up.
Instead of asking visitors to sign up immediately, why not ask them to first perform a task through which something of value is demonstrated. During such initial interactions the product can both show off its benefits, as well as can lend itself to personalization. Once users begin to see your product’s value and see how they can make it their own, they will then be more open to sharing with you additional information. Gradual engagement is really a way to postpone the sign up process as much as possible and still allow users to use and customize your application or product.