A continuing discussion over at Daily Episcopalian/Episcopal Cafe covering Sacramental Theology and the surrounding issues, particularly addressed in this essay is Communion without Baptism (or Open Communion, as some refer to it).
The following is a portion of an essay written by Derek Olsen:

You see, Anglican—Christian—sacramental theology is the logic and theology of intimacy. Even the metaphors Scripture uses for the relationship between God and believers bespeak this intimacy: to abide, to dwell with, to remain within. The prophets and poets of sacred page have used time and again the figure of bride and groom in scandalous and sometimes shocking ways to communicate both the depths of intimacy (Revelation and the incomparable Song of Songs) and intimacy’s betrayal (Ezekiel and Hosea). Remembering the logic of intimacy, remaining faithful to its vision of life in relationship grounds our ritual ways, our liturgical practice, in a theology that honors the God who has chosen to be in relationship with us.
At the heart of intimacy is commitment. Nothing more—and nothing less. Intimacy is not instant; it grows over time. Intimacy is a process of growing into knowledge, love, and trust gradually—and its gradual nature demands that those growing remain committed to the process and to each other. It grows through hearing promises, then seeing those promises come true; through sharing truths, then recognizing and confirming those truths embodied in the patterns and rhythms of everyday life.
In our sacramental life, the moment of commitment is baptism. Like promises exchanged between lovers, like the promises made before the altar in marriage, baptism is a covenant relationship. God is constantly inviting us into relationship, simultaneously presenting and fulfilling the promise to be in relationship with the whole creation and with each individual member of it. In Baptism, individuals—or those presenting them—both recognize the call of God and return the commitment, recognizing the identity of God as it has been revealed to us in the baptismal creed and promising to be faithful to the relationship with God. This, we believe, is an everlasting covenant….
Coming from this perspective, Communion without Baptism misreads the logic of the liturgy. It demands intimacy without commitment, relationship without responsibility. To apply this same logic to another sphere of human relationship, this is the logic of the one night stand—the logic of the “meaningless” fling. Is this the relationship that we wish to have with the God who knows us each by name and who calls that name in the night, yearning for our return to the Triune embrace?…
The seekers, the strangers, the wanderers in our midst—they are the ones in view here. And here is my question; this is what we must answer to the satisfaction of our own consciences: Do we have the right to choose for the stranger and the seeker a relationship contradicting the logic of intimacy without offering them a yet more excellent way?