Not a reality yet, but a link to an announcement is pasted below. Since Sun is standardizing on Mozilla soon, maybe internal web applications here can eventually begin taking advantage of this new technology. I also hope Mozilla's XForms support will be more forthcoming than its SVG support; i.e. you won't have to download obscure builds and/or it won't involve licensing wierdness with libraries.
Mozilla's Announcement (mozilla.org)
XForms Specification (w3.org)
