Here are some further thoughts on Pope Benedict XVI, what he said, and Islam:
Benedict Takes the Next Step with Islam by Mark Brumley
Ratzinger and Regensburg: On What Is a University? by Father James V. Schall, SJ
Is Dialogue with Islam Possible? Some Reflections on Pope Benedict XVI's Address at the University of Regensburg by Father Joseph Fessio, SJ
All are good reads. As usual, Against the Grain has a detailed roundup of published thoughts on the matter.
On another note, it seems that Froggy might be back. Let's hope he is.