Start listening to these bands immediately (but not particularly in this order (unless you feel like doing things alphabetically)):

Bon Iver*
David Dondero
The Deadly Syndrome*
Deer Tick
Dr. Dog
Fleet Foxes
Man Man*
MGMT
Modest Mouse* **
Okkervil River
Portugal. The Man
The Spinto Band
Sunset Rubdown*
Swan Lake
Why?*
Wolf Parade*

*Zachary Ryan's personal favorites
**Not technically indie, but has indie roots, and is still typically labeled as indie rock.

I could have added more, but I haven't listen to some enough to feel comfortable about adding them to this listicle.

The only one of those which I have heard of is Modest Mouse. But then again I'm not the most well informed when it comes to these things.