Today marks the crowning of our salvation and the revelation of the mystery before all ages. For the Son of God becomes the son of the Virgin, and Gabriel proclaims the grace. Wherefore, we also cry out with him, "Hail, O full of grace, the Lord is with you."
Full of Grace and Truth Blogspot and Mystagogy both have edifying entries for more than one year's celebration of this great Feast. Please consider visiting these sites and reading the offerings there under the March 25 date from various years: http://full-of-grace-and-truth.blogspot.com/ and http://www.johnsanidopoulos.com/