Here’s a link to a slideshow of it. These kids are WAY braver than I am.
http://news.yahoo.com/nphotos/Chicago/photo//090701/480/9ffd3328812f4de8a2b4e00e351417d9//s:/ap_travel/us_sears_tower_ledge
After viewing those slides, all I can say is...
No way in hell!
Too bad there isn’t much to look at.