something like this, if you want to display in your own custom way if you dont want to use ordered lists, etc.
Code:
<?php
$cats = get_categories('exclude=10,2,3'); // cat id's of 10 and 2 and 3 modify if needed
foreach ($cats as $cat) {
echo '<a href="'. get_category_link($cat).'">'.$cat->cat_name . '</a><br/>';
}
?>