New from ZendCasts.com there's a screencast that will help you ajaxify your Zend_Form instance with the help of jQuery.

We’re going to take what was put together in the last 3 videos and now include some server-side validation that will appear asynchronously. This is an example of using Zend_Form as a validation tool via JSON.

Here's the last three videos if you need to catch up:

• Encapsulating Business Rules with Zend_Validate
• Preparing Custom Elements for Zend Validators
• Writing Composite Zend_Form Elements

If you'd like to follow along with this most recent screencast, though, you can download the source directly.