Burkett's Rethinking the Gospel Sources. . .

and so am I. Delbert Burkett's 2004 book (vol 1 in a projected three-volume study on Gospel sources) raises some interesting implications regarding the difficulty of Markan priority (so he argues instead for a group of proto-Marks). Over the coming weeks I plan to respond to some of his points.

But I'm also planning to find time soon to comment on James Dunn's oral-Q theory ("Q" material = Mt-Lk double-tradition).