I'll second Iron and Wine.. also
City and Colour,( they sound similar to me, love them both.)
He Is We, (female fronted, AMAZING MUSIC)
The Decemberists (Their picking up in popularity, but I, personally, still haven't heard them on the radio)
The Hush Sound (Guy and Girl, never hear them on the radio, GREAT feel)
The Lighthouse and The Whaler
Lissie (Girl singer/songwriter, she's pretty laid back sounding)
The Maine (can be faster, but a great feel good group)
Minus The Bear
The Spill Canvas (Speed varies, but really good)
hope that helps:)