XForms: Where Do We Go from Here?
The above discussion only gives you a flavor of what's being considered as the future of form-based technology that may one day become pervasive. You can read more about these standards and the working draft of the proposal at http://www.w3.org/MarkUp/Forms.
Currently, none of the major browsers support any of these features. One Java-based browser that can provide you with a sense of these forms is X-Smiles.