There are a few things that I think would be very useful:
In the Widget Wizard - Would it be possible to insert a clickable link when using the "Image Rollover" feature to make rollover buttons?
In the Form Wizard - I could sure use a dropdown list field.
Another great Widget would be a fade-in slideshow - I notice that XSitePro uses the Ultimate Fade-In Slideshow from Dynamic Drive on the home page. Something like this would be great. Something similar to their Conveyor Belt Slideshow http://www.dynamicdrive.com/dynamicindex14/leftrightslide.htm
would also be really good for stores - I have used this one myself, but it is kind of a pain having to set everything up manually.