"We should also note that the reason that a lay person kisses the hand of a Priest or Bishop is to show respect to his Apostolic office. More importantly, however, since both hold the Holy Mysteries in their hands during the Divine Liturgy, we show respect to the Holy Eucharist when we kiss their hands. In fact, Saint John Chrysostomos once said that if one were to meet an Orthodox Priest walking along with an Angel, that he should greet the Priest first and kiss his hand, since that hand has touched the Body and Blood of our Lord. For this latter reason, we do not normally kiss the hand of a Deacon."
I must say that the latter explanation does not seem adequate for the deacon does indeed touch the Body of our Lord but I have never seen a deacon's hand kissed.
Fr. Deacon Lance