Asphyx's GPK: Fan page containing pictures, downloads, and information about the author.
GPK Central: Includes card profiles, search for cards, swap shop, and checklist.
Taras Garbage Pail KIds: Buy, sell, or trade both U.S. and foreign cards. Includes pictures and information.
The Garbage Pail Kids: Complete GPK reference site. See images of cards, memorabilia section, and picture/site of the month.
The Garbage Pail Kids Fanatic: Offers downloadable card lists and a for sale and trade section.
Wayne's Garbage Pail Kids References: Provides downloadable card variation checklists, price guide, and FAQ.