From Rollingstone.com:actually, it's 2 of the DCFC members. When i heard their nwe cd, you could hear a little of the Postal Service's influence on it.
"Benjamin Gibbard of Death Cab for Cutie has always been a daydreamer. But on Give Up -- his first album with laptop techno whiz Jimmy Tamborello, under the name Postal Service -- Gibbard leaves behind the dreamy indie rock of his regular band in favor of a cuddly little New Wave reverie."
It's two people, but only one guy from Death Cab.
But yeah, in Plans, you can totally hear Gibbard's techno-love, especially in the second half of the album.