At last night's Ann Arbor Drupal Meetup I gave a presentation on the Entityform module, including a pretty cool demo of building a room reservation system with email notifications and calendar view, all done without any custom code. The description, slides and recording are below.
The Entityform module enables a Drupal site builder to create front-end forms without writing any code, similar to the well-known Webform module. Entityform, however, has several important differences that may make it a better choice for your Drupal project. In this presentation, I will give an overview of the Entityform module, demonstrate how to configure it to build typical survey and contact forms, and then dive into some of the benefits of Entityform's entity and fields based approach, including the hundreds of available field types and integration with standard tools like Rules and Views. I will also demo a new module I've written to integrate Entityform with the Organic Groups module.
Slides and links