Taipei 101 - The World Tallest
Taipei 101- The World's Tallest Tower - 509 m

Most important websites:

Official Site
The official website of Taipei 101 (and Taipei 101 Mall)
Official Taipei 101 site

Emporis Website
Construction, technical datas, company names involved..
Emporis Taipei 101 Data

Main information on the building in the biggest online encyclopedia
Wikipedia - Taipei 101

Daniel M. Shih Gallery
A large gallery with breathtaking photos of Taipei 101 on Flickr
Taipei 101 Gallery