Deep into Justin Vernon's universe right now...
DeYarmond Edison - Silent Signs (2005) - Vernon's first band, very good folk, Americana sound. From the ashes of this band would rise Bon Iver, Megafaun & Field Report.
Amateur Love - It's All Aquatic (2003 - re-released in 2012) - This album is from his friend & fellow Wisconsin resident, Josh Scott. The main reason Justin Vernon formed his own record label was so he could re-release this album. Excellent straight forward indie rock. Josh Scott is said to be working with Vernon on a new record as Aero Flynn.
Megafaun - Bury the Square (2008) - Three members from DeYarmond Edison went on to form Megafaun based in North Carolina, actually 2 of them were also in Amateur Love as well. Good folk/psych music, definitely more psych than Vernon's music.
S. Carey - All We Grow - Sean Carey is the plays piano & drums for Bon Iver and is a fellow Wisconsonite. I've been playing this in preparation for an intimate show he is playing tonight a couple miles from my home.