Is there a good AJAX/JQuery way of validating forms that works well with Django's form models?

Especially validating forms "live"...when the user goes on to the next field, and telling the user that his previous one was not valid.

What options are available, and what would you use in conjunction?

Ajax Validation package by django core developer Alex Gaynor is pretty awesome and probably what you want.

The best part is that you define only the standard django forms and the validation happens even after the submit.