Show entry content for other available locales
I think the best way to do this, is by using craft.entries.id().locale() and checking if any entries are returned (not tested):

{% set thisEntryInDifferentLocales = craft.entries.id(thisEntry.id).locale('fr') %}
{% if thisEntryInDifferentLocales | length %}
    {% for localeEntry in thisEntryInDifferentLocales %}
       &lt;a href="{{ localeEntry.url }}"&gt;This entry is also available in {{ localeEntry.locale }}&lt;/a&gt;
    {% endfor %}
{% endif %}