From this list, i'll take Jens and M. Ward, and add Neko Case and Josh Rouse with Andrew Bird and Ron Sexsmith slightly behind them. Brendan's Lapalco was phenomenal, but his followup was average, and his debut was from the 90's. I pretty much don't care for anybody else on your list, sari.
Best Pop/Rock Songwriters of the Decade
Carl Newman
Jens Lekman
Ted Leo
John Darnielle
Matt Pond
Brendan Benson
John Vanderslice
M. Ward
Charlie, thoughts on Josh Ritter?
You might not, but I would nom Glen Hansard.
I did go back to the original, just checking to see if parameters had changed based on responses.
My original pick, Death Cab, someone asked the difference between DCFC and Modest Mouse. Not sure, pretty even, my own personal experience is DCFC is better known among more age groups. Also, not being snarky, but curious if this gives them a leg: Ben Gibbard and a Grammy nom.