Zee Avi is one of those artists discovered via YouTube. She released her debut album in May 2009 and is now touring with Lilith Fair. Hearing her the first time I immediately thought of an upbeat Cat Power.
From her website:
"Zee Avi is just 23 but she's an old soul. A huge talent in a petite frame bringing a universal message from the unlikely birthplace of Borneo... With an eclectic pool of influences that range from such eccentrics as Cat Power, Regina Spektor, Leonard Cohen, Tom Waits..."