Boto EC2: Create an instance with tags
ec2server.create_instance(
        ec2_conn, ami_name, security_group, instance_type_name, key_pair_name, user_data
    )

rsvn = image.run(
  ... standard options ...
)

sleep(1)

for instance in rsvn.instances:
   instance.add_tag('<tag name>', <tag value>)