Different Subject For A Content Type When On Front Page

It would help if you said either 'title' or 'teaser' as those are the terms used to describe the content bits. :-}

Teaser is easy.
To create an alternate title you could use CCK to add a text field, and then theme your teaser displays to show that instead of your $title.
If you don't want to theme, you can install http://drupal.org/project/text_field_tags which will enable you to set any text field as a link to the node. But you probably want to theme it in your node.tpl.php

.dan.
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