Drupal 7 Forms Tutorials

Drupal 7 - Custom Form (Blog)

Drupal 7 - Simplify Module (Video)

Drupal 7 - Ajax Forms #1 - Partial Refresh (Video)

Drupal 7 - Ajax Forms #2 - Autocomplete Example (Video)

Drupal 7 - Chosen Module (Video)

Drupal 7 - Field Conditional States Module (Video)