There's an interesting discussion going on among the biblioblogs:
1. Book Review: The Five Gospels: What did Jesus Really Say? (The Sword)
2. Searching for the Authentic Voice of Jesus (Hypotyposeis)
3. "Render to Caesar..." (The Busybody)
4. Context and Nuance in Jesus' Sayings (NT Gateway Weblog)
5. Carlson on the Jesus Seminar (The Sword)
6. More on the Jesus Seminar, and methodologies (The Busybody)
7. Mark 7.15 (Earliest Christian History)
8. Mark 7.15 (Biblical Theology)
9. More on Mark 7 (Earliest Christian History)
10. Mark 7.15 and Purity (Euangelion)
11. More on Mark 7 (Biblical Theology)
12. Mark 7.15 and Authenticity (Euangelion)
If it continues, I'll update, as time permits.