Today is the day for shameless promotion. Be warned, each of these artists have varying styles. They're just what's swimming in my head right now.

Musicians that are definitely worth checking out:

Passion Pit
MGMT
Anberlin
Swimming With Dolphins
Rooftop Revival (recently disbanded, but they had some awesome music)
Joshua Radin
Fleet Foxes

Now go find them online somewhere and do them some justice by buying their songs or albums.
:D