I know that XML support is not one of Webuidlers strengths, but I'd love to see a new product (possibly a version up from Webuilder) that had many of the features of XMLSpy Home Edition
(see http://www.altova.com/matrix_x.html for more info).
I would happily pay $60 for such software in an instant and I'm sure there are many other people that would like to see such a code editor.