In the new Acrobat 9, the Forms Toolbar isn't just hidden, it's GONE! Many Acrobat features received tweaks and gentle improvements in the upgrade from 8 to 9, but the way PDF forms are handled in Acrobat 9 is a complete rewrite. In fact, forms are now handled in a new interface–the Form Editing Mode. In this new interface, you can manually add or edit form fields in roughly the same way you could in earlier Acrobat releases.
The real magic surfaces when you call up the Form Wizard. With a potential PDF form already open (any PDF you've created that actually looks like a form will do), choose Forms > Start Form Wizard.
The wizard asks you a few questions about your form, such as which file to process, and then takes you into the new Form Editing Mode.
The wizard also performs a rather impressive operation which analyzes your file in order to try to identify, create and name form fields for you. Although rarely a perfect form at this point, Acrobat's Form Wizard takes on much of the preliminary work you would be doing painstakingly by hand, and leaves you with an editable, and often very reasonable starting point. I have been pleasantly surprised at the Wizard's ability to detect radio button groups appropriately, and it cleverly names each field with the text it assumes describes the input.
There will be those files on which the Wizard simply can't perform its magic. For these jobs, you can choose (in Acrobat 9's main interface) Forms > Add or Edit Fields to jump to the Form Editing Mode without the Wizard's help. From there, you can click the Add New Field button and work much like you did in previous versions of Acrobat.
Anyone find the Walk the Dog or Take Out the Trash Wizard yet?