Well, Haim is one of my favorites right now. I love this whole album. Lots of fun tunes to dance to, and play really loudly in your car. Fleetwood Mac-ish indie pop. This is also their debut album.
Lorde dropped her debut album, and it took me a while, but I'm really digging the music. 400 Lux, White Teeth Teens, and Buzzcut Season are a few of my favorites. She grew up with her mother reading poetry to her, so that's how she ended up making her own music. Plus, she is only 16. Bravado is a good song that is not on the album.
Little Games by The Colorist is a fun little song. I enjoy playing this song from this new band.
Hot Knife by Fiona Apple, because it's Fiona Apple. Strange little tune, but it's catchy and fun. Fiona sounds awesome in her vocals.
Fireshrine by Purity Ring is a really strange, but interesting electronic song.

I have a pattern for unusual music choices, but I find they are some times the best treasures.
Siberia and it's Acoustic version are my favorite Lights albums. Her first album was pretty good, too, but I enjoy the acoustics from Siberia.

I'm sure I can dig up more, but that should be a good start. :)

Related categories:

Reddit mentions of Fineshrine