Use text from body to show title in the topics list

Hey,

I've migrated a phpbb installation to a Drupal installation where I use the Advanced Form module. However, some of the forum titles has gone during the migration. So the only way I can access the forum topics is through Drupal's content menu.

I'd like a feature that will use the first 35 characters of the forum topics body to display that as a title, in case there isn't any.