Plone Formgen has been improved and made easier to use. This how to describes how to create a form. There is also a more in depth tutorial available.

To create a form in plone 4, click on the add new drop down on the edit bar. Select Form Folder.

The Formgen parameters form will appear.  Fill out the form. then save.

Select Quickedit from the edit bar and start creating fields on your form.