Go see the movie ONCE.
I've gone twice so far. It's incredibly good. Glen Hansard sings with so much passion. And Marketa Irglova charms you the second she shows up on the screen.
I went straight from the theater to the record store to by the soundtrack (luckily I saw it at a mall).
So go. It's the first moivie in a long while that I KNOW I'm buying when it comes to DVD.