How to remove colon in a label which is not in a form - D6
Drupal 6 or Drupal 7? The Drupal way to do this would be to modify the content field template in your theme to remove the colon OR create a custom node template to render the fields without the colon. For the content-field option, in Drupal 6 this file is in your cck folder under:

./modules/cck/theme/content-field.tpl.php

Copy this file to your themes folder and modify it to remove the colon at line 18:

&lt;div class="field-label"&gt;&lt;?php print t($label) ?&gt;:&amp;nbsp;&lt;/div&gt;


For a node template, check out the handbook on node templates, theming, etc: 

http://drupal.org/node/190815#node-suggestion

There's also this module

http://drupal.org/project/no_colons

if you want another alternative.