Death Cab for Cutie. Incidentally, they have one of the most stupid sounding pathetic band name ever (although, The Goo Goo Dolls come close...).
I think you could describe them them as something along the alternative rock/indie band route. Owl City has often been accused as being a perfect cross between Death Cab for Cutie and The Postal Service. Up until OC's newest album, this analogy, in my personal opinion, is extremely accurate.
I've only had time to listen to one of their albums, "Plans". As far as secular music goes, these songs are definitely becoming some of my favorite listens.
More later,
K-Minty