SharePoint 2010 and InfoPath are good friends. You can use InfoPath to modify the display and input forms of a list. When you have a list with multiline text fields the input boxes get a default height of 100px. You can set the height in the properties window of the control in InfoPath. When you view a list item (dispform.aspx) then the textboxes get an annoying scrollbar. This is not user-friendly. There is a solution for this:
In the properties window of the control, in the “size” tab. You enter “auto” as value. Now the textbox will auto scale on the form.