Links
Roller Coaster sites are very popular on the internet.

Valleyfair! Picture courtesy of CoasterGallery.com, used by permission.

Favorite Sites
Roller Coaster Database This site has info on almost every coaster on the planet
Coaster Gallery My favorite coaster picture site, has pictures of over 40 parks.
Joyrides Another picture site with pictures of about 15 - 20 park.
Hypercoaster Another great hypercoaster site with plenty of hypercoaster reviews.

Other Great Sites
Coaster Globe A great site with glossary, park reviews, info on defunct coasters, and more.
Thrill Network Forum / Boards This is a huge forum on parks and coasters.
Coaster Force This is a very comprehensive site on roller coasters, elements, manufacturers, etc.
Six Flags The official Six Flags site.
Cedar Fair The company that owns Cedar Point, Dorney Park, Knotts Berry Farm, Michigan Adventure, Valleyfair, and Worlds of Fun.
Coaster Count
Amusement Link One Source Features over 100 links.
Thrill Network A great coaster site w/ info on TV coaster shows, rumors, news, etc.