I used this approach to solve another similar situation (with Related Entries):
{exp:tag:related_entries entry_id="{entry_id}" weblog="{my_weblog}" dynamic="off" limit="1"}<h3>Related Entries:</h3>{/exp:tag:related_entries}
That works.
P.S. But I’m sure you’ll add a TAG counter in one of the future versions to solve that in a simpler way.
