silverchair's new album "Diorama" is the best album I've heard since "What's the Story Morning Glory", maybe since Achtung Baby. Seriously, even if you hated silverchair's older music, the newer stuff is so beautiful you may love it yet. The old guitar-based stuff isn't gone, though, just subdued.
I recommend:
Across the Night
Greatest View
Without You
World Upon Your Shoulders
Tuna in the Brine
and for the harder rockers, One Way Mule
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And you brighten my life like a polystyrene hat
But it melts in the sun like a life without love
And I've waited for you so i'll keep holding onWithout you