Make textbox contents accessible to screen readers
Currently, when a screen reader like JAWS encounters a textbox, the contents of the textbox are not accessible. At the least, the Show Data table should produce a single-cell table containing the contents of the textbox. Ideally, the contents of the textbox would be available to the screen reader without having to go to the Show Data table.
Maybe an improvement on this idea would be to auto-populate alt text for text boxes with the text box contents by default.