ETAPI is an ExactTarget API wrapper for XML calls.
subscriber_add : add s4 :account_id, add :status
subscriber_edit : add s4 :account_id, add :status
subscriber_retrieve : add s4 :account_id, add :status
subscriber_retrieve_from_list
subscriber_retrieve_from_list : add s4 :account_id, add :status
subscriber_retrieve_lists
subscriber_retrieve_lists : add s4 :account_id, add :status
subscriber_unsubscribe_master : multiple email addresses
list_retrieve_subscribers : add s4 :account_id, add :status
email_retrieve_body : have access to sub accounts?
Any other XML calls available will be added by request