When I was home last month I was saying to my Mom I couldn't remember the last time I went to the top of the Sears Tower, but i do know when my next visit will be: Very, very soon.
In June they're opening an enclosed glass ledge that sticks out 4.5' from the sky deck so you can look straight down from 103 stories in the air. Awesome. I get a roller coaster feeling in my gut just thinking about it.
News link on the matter.
But let me say I'm not a fan that they're changing the building name to the Willis Tower, but it's nice of them to name it after Greg so we don't miss him so much.