Here is an interesting article on the different diaconal practices of the Oriental Orthodox Churches:
http://www.nccbuscc.org/comm/archives/2003/03-133.shtmlAlso, here's a link to one of the best studies out there on the role of deaconesses:
http://www.amazon.com/Deaconesses-Historical-Study-G-Martimort/dp/0898701147Of course, one "weakness" of the text (which is actually more of a weakness of readers like myself

) is its use of original languages in both the text and footnotes, which is great for the specialist, but difficult for the average Joe "Armchair Theologian" Sixpacker like myself.
Women Deacons in the Orthodox Church: Called to Holiness and Ministry by Kyriaki K. FitzGerald is a fascinating study, although the title "women deacons" indicates her theological position vis-a-vis the ministry of "deaconess" as the female equivalent of the male diaconate. Martimort seems to think the evidence for this is far less conclusive.
http://store.holycrossbookstore.com/1885652224.htmlThe International Theological Commission also did a cursory treatment of the ministry of deaconess in its
From the Diakonia of Christ to the Diakonia of the Apostles.
In a review of the text by HPR (Homiletic and Pastoral Review), two of its conclusions are mentioned:
(1) The deaconesses mentioned in the tradition of the ancient church�as evidenced by the rite of institution and the functions they exercised�were not purely and simply equivalent to the deacons; (2) The unity of the sacrament of Holy Orders, in the clear distinction between the ministries of the Bishops and the Priests on the one hand and the Diaconal ministry on the other, is strongly underlined by ecclesial tradition, especially in the teaching of the magisterium.
http://www.ignatius.com/magazines/hprweb/bk_ITC.htmApart from the issue of the nature of the ordination of deaconess, the unity of the sacrament of Holy Orders mentioned above presents the greatest challenge to the universal acceptance of the ministry of deaconess as the hierarchical "equal" to the ministry of the male diaconate. As was seen within Anglicanism and certain forms of Lutheranism, the ordination of women "to the diaconate" begs the question - why not then to the presbyterate or to the episcopate?
Clearly one can say that a distinction exists between the kenotic and sacerdotal forms of service within the sacrament of Holy Orders, and the deacon is not merely a "priest, second-class" (although the recent development of a "presiding diaconate" within the Latin Church seems to regard this ministry that way). The ministry of deacon, which, like the presbyter, flows from the fatherhood of the bishop, is nevertheless distinct from the ministry of presbyter. The "ladder" model which positions the ministry of deacon as a rung on the path to "higher" orders in its own way diminishes the distinct and permanent charism of the deacon within the ecclesia. (I personally prefer the Trinitarian image from Irenaeus of the "two hands" of Fatherhood representing the two forms of ordained ministry - deacon and presbyter.) The source of the unity of Holy Orders is not then the deacon's relationship to the presbyter as a "rung" on the ecclesial ladder, but rather the fatherhood of the bishop, as expressed by the ancient practice of the laying on of hands as a sign of "blessing" and the transfer of patriarchal authority to govern the household and all its goods. (The interesting practice of the "laying on of hands" of the newly ordained presbyter by his brother presbyter would also be an fascinating study. No such practice is done with ordination to the deacon, indicating an "exclusive" connection of the deacon to the bishop as his "origin".)
Of course, if one follows the traditional hierarchical "ranking" of subdeacon, deaconess, deacon, presbyter, bishop, one wonders whether an argument could be made for regarding the deaconess as a form of minor orders as opposed to major orders. The difficulty here is that, as Father Serge has observed, the Byzantine Ordination rite for the Order of Deaconess follows the same pattern as the Order of Deacon, although the words used in the prayers are different.
For instance: in the prayers for ordination of a deacon, the ordinand is appointed to serve as a minister at the Lord's "immaculate mysteries", with Stephen as the model. In the prayers for the ordination of a deaconess, the ordinand is appointed to serve in the Lord's "holy houses in accordance with what is fitting", with Phoebe as the model. (Specific mention is made of the Lord not rejecting women who "offer themselves" to minister in the holy houses.) The bishop asks God to grant her the grace to "persevere blamelessly in your holy temples, to cultivate appropriate conduct, and especially moderation." Also, the Lord speaking to the apostles concerning the nature of the diaconate is specifically mentioned in the ordination of the deacon, while the "sanctification of the female" through the birth of the Savior from the BVM and the granting of the Holy Spirit in His "advent" to both men and women is specifically mentioned in the ordination of the deaconess, indicating the "pentecostal" nature of the ordination event.
Both the deacon and the deaconess are called to the "work of diaconate" in the ordination rites.
Interesting stuff...difficult to fully discern, but a very interesting pastoral and ecumenical challenge.
God bless,
Gordo