I know that this is an older post, but I believe Tigger still posts here and I wanted to give another perspective on the issue of open communion. I think in most people's minds, closed communion is most commonly found in Eastern Orthodox, Roman Catholic, and confessional Lutheran denominations (such as the LCMS). I agree with the others who have posted here that being denied communion when one is a baptized Christian can be quite awkward when visiting one of these churches or even off-putting. I'm not saying that this is necessarily what I believe, but I completely understand, respect, and appreciate when a church takes a serious stand for what they believe and that they practice these beliefs (regarding closed communion), even when or if I do not agree.
I spent about two years in an LCMS parish and, although I am a baptized and confirmed Anglican, I could not receive communion in this parish without Lutheran confirmation. Never once did I feel like I was unwanted or that something was wrong with me; however, the pastor kindly explained the seriousness of communion and the importance of understanding their doctrines and practices surrounding communion before being communed. The parish, pastor, and leadership were all very kind and I never felt like I was not good enough or their type of Christian. The Eastern Orthodox parish I visited much later, while not being quite as warm as the Lutherans, were still very welcoming and accepting of my family and myself and the priest took the time to explain their beliefs about communion to me. I really appreciated how both pastors cared enough about me to protect me from myself, as taking communion unworthily is pretty risky business. I am not saying I necessarily agree with all their reasoning, but they care enough to take these precautions and that is awesome.
Although I empathize and hope for the day when all baptized Christians who subscribe to the Real Presence can commune with one another freely, I also understand and respect those who take communion as seriously as they do (like the Bible tells us too).
It is also important to note that not all Anglicans practice open communion, though I believe the vast majority do. My own Anglican parish takes a sort of "middle way" approach to the issue. Anyone who has been confirmed by a bishop in apostolic succession is welcome to commune. Furthermore, baptized children who are unconfirmed but have plans to be confirmed and are close in age to confirmation are allowed to commune. The bishop explained to me, after I asked him about communing my son (who is 9), that the historic view of the Church is baptism and confirmation before communion, but a rubric allows children to be communed who meet the above criteria. I am not sure whether this rubric is in the 1928 Prayer Book or Anglican/American Missal (Albion I may need your help here, as I am still navigating my way around the '28 BCP), but this is what I was told. I personally have no problem with this approach as I find this "middle way" kind of avoids the extremes of going one way or the other. Furthermore, with unbaptized communion on the horizon for the Episcopal Church, I kind of appreciate the efforts of my parish to resist this sort of drift. I guess my fear is that baptism without confirmation could lead to a totally open communion of the unbaptized. After all, are we truly welcoming and caring when we seek to meet someone's needs of instant gratification rather than their spiritual well-being?
I think one of the difficult aspects about this topic and many other topics is how do we tell when we are confusing our own hopes, wishes, and desires with the teachings of the Church? Is open communion more about us and our need to feel instantly accepted and gratified or is there something else going on here? I am as guilty as anybody when it comes to substituting what the Church historically teaches for what I personally think. No judgement on my end, just some food for thought.