Emporis:An international team maintains this huge database of tall buildings, navigated by map and list. Also lists construction companies and architects, and supplies news.
All About Skyscrapers: Explores a wide range of aspects of the skyscraper.
Damien's Skyscraper Page: Damien Koh's drawings to scale of the world's tallest buildings make it easy to compare heights and construction. He also supplies photographs and facts on each one.
High Rises: A photo gallery by Matthew Armling of highrises, skyscrapers and towers in New York, Hongkong and Frankfurt.
How a Skyscraper is Made: Background, history, raw materials, design, and the construction process of skyscrapers, from Thomson Gale's How Products Are Made.
How Skyscrapers Work: This illustrated narrative by Tom Harris from HowStuffWorks explains that the main technological advancement that made skyscrapers possible was the development of mass iron and steel production.
MoMA: Tall Buildings: New York's Museum of Modern Art's permanent tall buildings exhibition presents a focused study of twenty-five tall buildings around the world. [Requires Flash 6 or higher and Acrobat Reader].
Skylines and Scrapers: Egbert Gramsbergen presents worldwide highrise statistics, using graphs and various ranking methods.
Skyscraper Page: Dylan presents an illustrated database of the world's tallest buildings. The illustrations drawn to one scale make it easy to compare heights internationally or within a city. Includes dates and architects.
Skyscraper Picture Collection: Collection of photographs by Patrick Beckers of cities across the world and their tallest and most distinctive skyscrapers.
Skyscrapers: Images, information, and 3D models of a selection of skyscrapers around the world from Great Buildings Online.
Stock.xchng: Skyscrapers: Royalty free stock photography community - images in the skyscrapers category.
Tall Building Teaching and Research Group: A group of international experts in tall buildings web site which features articles, images and field studies from across the world.
The High-Rise Pages: Articles, images and wallpapers of the tallest buildings in the world.
The Skyscraper Museum: Private, not-for-profit, educational corporation devoted to the study of highrise buildings. Exhibits and information on the architecture, materials, and physics of highrise construction.
The Tallest Buildings in the World: A list of the tallest buildings in the world, with a graphic showing the tallest.
Wikipedia: Skyscraper: A comprehensive article from the collaborative online encyclopedia on the skyscraper's historical development.