The World Wide Web Consortium (W3C) has released the final specifications for what will be the standard for XForms. XForms uses XML to improve upon the limitations of standard HTML forms. By using XML, the forms can be created in a much more flexible and open manner, allowing them to change in response to the data that is entered.
What this means to you, the developer, is a standard for making forms in web pages easier with greater control over the interface. It also supports multiple forms per page and multiple pages per form. Its a treat if you do a lot with forms - the only problem is, of course, getting support for them.
Find more information about XForms from W3C: