I don't know about songs, but albums from 2009 that I've liked so far include:

Bat For Lashes - Two Suns
Fever Ray - Fever Ray
Yeah Yeah Yeahs - It's Blitz!
Blue Roses - Blue Roses
Antony and The Johnsons - The Crying Light
Jenny Wilson - Hardships!


..but really, there are many albums released in the past year that I just haven't gotten my hands on yet.