The skyscraper attack scene has been leaked on YouTube, thanks to YouTube user jordanwadejames. http://www.youtube.com/watch?v=DKxBiYDiW6E
Again, the video is not embedded. Sorry.
And in case you missed it, here is the final fight: http://comicbookmovie.com/fansites/runDTCFansite/news/?a=40691
"Transformers: Dark of the Moon", starring Shia LaBeouf, Rosie Huntington-Whiteley, Josh Duhamel, Tyrese Gibson, Patrick Dempsey, Frances McDormand, John Malkovich, Alan Tudyk, and John Turtorro, is now playing in 2D and 3D in select theaters.