Surprised there isn't a topic about this here. Under construction in Tokyo is the replacement for Tokyo Tower. It's commonly known as New Tokyo Tower, but they held a contest to name the tower, and the winner was Tokyo Sky Tree. I'm not liking the name, but I can't wait to see the tower completed at the end of 2011. It will be 610.58 m (2,003 ft) tall, and make it the tallest structure in Japan when completed. There will be 2 observation levels, one at 350m, the other at 450m. Both are higher than the top of Tokyo Tower (333.33m). What a view that will be! Here's the official website: http://www.tokyo-skytree.jp/english/
The Japanese page has more pictures.