There are, as to be expected, many responses to the Advent letter. For a more complete list, go to Episcopal Cafe.
Some which are worth noting:
Kendall Harmon (T19): This is a thoughtful, prayerful letter and deserves to be treated as such by all Anglicans.
From Bishop Iker (Fort Worth): “The best assistance that the Archbishop can offer to address the situation in TEC is to host a mediation that seeks a negotiated settlement for separation, without rancor or litigation.”
John Richardson thinks the Archbishop is finally leading: Leadership and Lambeth - Dr Williams’ Advent challenge to the Communion
Fulcrum has a more hopeful analysis: Fulcrum Response to the 2007 Advent Letter