The Decemberists for sure.
Thomas Cunningham is a lot like Brett Dennen.
El Ten Eleven (more instrumental)
Woodpigeon - Indie band from calgary , kinda hard to find on the net
Iron and Wine
Damien rice - becoming more main stream
Joeburton77 on youtube, his original music
newschoolers listen to Sam beam, I R shocked
OH and john butler. from australia soo good
fuck yeah, i love the mountain goats!! you ever hear atom and his package? he covers a few songs in a very different but very cool way.
druthers had a good list of these types of bands
to add a few more (sorry if there are repeats)
my morning jacket
old crow medicine show (more bluegrass)
she and him (zoey deschanel-super sexy and marrying the dude from deathcab/postal service)
michael franti & spearhead
dispatch/state radio (same lead singer, dispatch is better imo)
the bird and the bee
john butler trio (grand national is a great album)
a good place to find stuff like this is http://daytrotter.com/
sigur ros also a fav.