I'm including anyone who has come out with a debut this year, even people going solo from bands that were around before 2006.
Glen Hansard and Marketa Irglova
Band of Horses
Emily Haines & The Soft Skeleton
Jenny Lewis with The Watson Twins
Michael Leviton
Birdmonster
Gracer
Beirut
Islands
Eric Bachmann
My list of bands I've first heard this year would be far longer.