I stumbled across this list of the twelve "top" skyscrapers in the world. I'd assume that by "top" they mean by height. They're also including a few skyscrapers that have yet to be completed.
The list doesn't name the structures, so let's try to do it here:
1. Eiffel Tower, Paris
2. Burj al Arab, Dubai*
3. Jin Mao Tower, Shanghai (thanks Fargus!)
4. Sears Tower, Chicago
5. Petronas Towers, Kuala Lumpur
6. World Financial Center, Shanghai*
7. Taipei 101, Taipei
8. Twin Towers of Canton, Guangzhou (Canton), China*
9. Freedom Tower, NYC
10. New Tokyo Tower, Tokyo*
11. Burj Dubai, Dubai*
12. Bionic Tower, Shanghai*
That's all I can name off the top of my head. Anyone? Link
*Thanks, Roadtrip!
The CN Tower in Toronto, Canada stands 533m tall. It will soon be shadowed by a few of these new ones but as of now, it's numero uno.
And not even on that list! Gaaah!
http://en.wikipedia.org/wiki/Tallest_buildings
This link appears to be the most accurate list I've found on this subject. Wiki. Figures.