The news is full of the amazing linup for this concert, which now includes Paul McCartney, the Who, Bruce Springsteen & The E Street Band, Alicia Keys, Kanye West, Eric Clapton, Eddie Vedder, Billy Joel, Roger Waters and Chris Martin. But the best news I've heard is... if you can't make it in person to the sold out show at Madison Square Garden, you can watch it live on TV. PBS channel 13 should be carrying the concert on Wednesday night.
For more information check out this article, or just google for 12-12-12 Sandy concert and you'll find dozens more.