Cincinnatian Trilobites: Information about trilobites from the Upper Ordovician Period Cincinnatian Seiries of Eastern North America. Includes images and links.
Introduction to the Trilobita: UCMP Berkeley introduction to the trilobite fossil record, ecology, systematics and morphology.
Mr.B.Bug's Trilobite World: An entertaining and informative approach to the subject of trilobites and trilobite fossils, with animated graphics and audio.
Palaeontology - Research - What are Trilobites?: A short intro to trilobites, courtesy of the Australian Museum Online.
Per Hansson's trilobite gallery: Swedish trilobites.
The Semi-Compleat Trilobite: A page of trilobites with images broken down by time period.
Trilobites: Photos of trilobites from around the world, as well as a searchable database of over 280 specimens.
Trilobites - Utah Geological Survey: Trilobites and the Cambrian Environment of Utah, an essay by Rebecca L. Hylland.
Virtual Wonders: Trilobites: The Natural History Museum's online exhibit of several bizarre trilobite taxa from Morocco, including three dimensional views of new specimens.
Weeks formation and Indiana Trilobites: Images of and information about a personal collection of well-preserved trilobites found in Indiana and the Weeks Formation of Millard County, Utah and Indiana.