What are some good indie bands/singers similar to Elliott smith or Conor Oberst?
There are a lot of good and new indie bands/singers that you can listen music from. I can suggest you these: Arcade Fire, Azure Ray, Beirut, Bright Eyes, Conor Oberst and the Mystic Valley Band, The Decemberists, Interpol and Mates of State.
I like MGMT, Neon Indian, Lily Scott, The Postal Service, Death Cab for Cutie, Arcade Fire, The Killers, Same State.
Perhaps Sufjan Stevens, Catpower, Sharon Van Etten, Will Oldham, Wilco, The John Francis, Modest Mouse, American Music Club, Edith Frost, Iron & Wine, The Tallest Man on Earth, Bon Iver, M. Ward.. If you don't know Bob Dylan or Neil Young, you should know Bob Dylan and Neil Young. Trust me! They are important predecessors