UIHint does not work. I'll come up with an alternative approach. Actually, UIHint shows the column on edit and details view, just not in the List view. The right way to do this is copy the text field template to text_Big and truncate the text to something reasonable in the text_Big template. You don't really want to show 100 pages of text do you?
If you want to show the first N chars in the list view, I need to work on that.