Update: The Sears Tower is now called the Willis Tower as of July 16th, 2009. Of course it’s a goofy name, it’s new.
Not to be a rabble rouser (one that stirs up the masses of the people)…
But the Sears Tower has a new glass observation deck, generically named The Ledge, which looks scary and awesome.
Similar to the Grand Canyon Skywalk (except it’s easily accessible and doesn’t require driving for 6 hours to the middle of nowhere).
The CN Tower in Toronto has had something similar for quite awhile. I just happened to be in Toronto and paid it a visit. It was awesome and scary too. I’ll admit, the Sears tower one looks scarier, but it’s still not as tall as the CN tower 
Now if they build something like this in the Burj Dubai (official tallest building in the world)… I’m all over it
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