I'm still itching to find my way to the IMAX to watch "I Am Legend" for the primary reason that I would get to see a 6-8 minute clip of the Joker from the new Batman movie "The Dark Knight". But in case you've missed what's happening, here's trailer that apparently appeared along with it.
A better quality version can be found here.
And I'd be curious to hear what you think about the look of the new joker. I thought Nicholson did a good job but sometimes came across almost too goofy. I nearly choked when I heard they got Ledger, but what I've seen so far looks good.