Here are my TOP TEN:
1. New York City - unbelievable density - more like a wall than a skyline
Photo credit: RFC Graphics
2. Chicago - a close second...
Photo credit: Westsidelife-SSC
3. Toronto - height, density, and close to home too
Photo credit: pineapplejoe301-flickr
4. Los Angeles - towering skyline in the land of fun & sun
Photo credit: Matthew Field-flickr
5. Houston - great collection of skyscrapers in Texas
Photo credit: George Hosek
6. Seattle - reminds me of Toronto but with mountains
Photo credit: fotorcs-webshots
7. Dallas - another great collection of skyscrapers in Texas
Photo credit: Texas Star
8. Miami - growing fast, but too spread out for my taste
Photo credit: Marc Averette
9. Calgary - very impressive for its size
Photo credit: Kev D-SSC
10. Would be Vancouver, but I have to go for my home town of Kitchener...
Photo credit: myself