I'm picking up the Arcade Fire disc this evening, but from what I've heard (a few tracks on WOXY.com plus the Merge Records site), it's really damn good. Good enough that I'm seriously thinking of attending their Philly show in November.
The album is receiving a lot raves: Pitchfork gave it a 9.7; the AMG gave it 4 stars, which again, is pretty impressive considering this is their debut.