title: Multiple Checkbox Lists, item can only be selected in one list
body: <p>I have a selection of categories.  I will have one or many textareas on a page.  Each textarea can be assigned to one or more of each category.  Each category can only be assigned to one textarea.</p>
  
  <p>This is purely conceptual as this point, no code written yet.  I'm thinking each textarea would have a jQuery checkbox list.  The page starts out with a single textarea and it's related checkbox list.  All items in the list are selected.  User chooses to add another textarea (with a checkbox list).  All items in the second checkbox list are disabled, as they are already assigned to textarea 1.  As I uncheck items in the first list, they become enabled in the second list and can be checked.</p>
  
  <p>Thoughts?  Good or bad UI?  How hard would this be to code?</p>