Is there a CCK fieldtype that would display a static field?
If I understand correctly, you don't need an input element at all. In this scenario, you can use hook_form_alter() or hook_form_FORM_ID_alter() in a custom module of site specific customizations to add a form element of type 'item':

$form['my_form_component'] = array(
  '#type' =&gt; 'item',
  '#title' =&gt; t('My Label'),
  '#markup' =&gt; t('This text follows the label'),
  '#description' =&gt; t('An optional description appearing below the markup'),
);


See the Forms API Reference for more details.

Edit: If you're not interested in custom modifications, the Markup module seems to provide this kind of utility in a contributed module for D6