It would be very helpful to have an option of creating PDF forms in Illustrator.
Creating forms in Acrobat PRO is very clunky for anyone who needs more design oriented features. It would allow graphic designers to create editable PDF templates for products such as cards, invitations etc. Such templates are in a high demand, people want to purchase files that can be edited with ease and there are no good options for creating them.

Such feature would also be very helpful in InDesign for catalogs, brochures, anything with multiple pages.