There is an excellent short article by Alcuin Reid in this week's Catholic Herald. You can read the article (with comments) at Fr Z's blog - Catholic Herald: Alcuin Reid on what the Pope is doing with ad orientem worship.
The article appears on page 4 of the paper as an "Analysis" piece below the report on the Holy Father's Mass in the Sistine Chapel last Sunday. The page is illustrated by a striking PA photo showing the whole of the "last Judgement" and part of the ceiling. At the bottom, there are the small figures of the Holy Father and ministers at the moment of the elevation of the sacred host.
Dr Reid's article is a good short summary of the case for eastward facing. It concludes with a quotation from Cardinal Ratzinger's "The Spirit of the Liturgy", ending "Looking at the priest has no importance. What matters is looking together at the Lord."