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Access Excellence - Search for topic -lots of info.(Good Sci. Teaching Resource)
Anatomy of the Human body - Univ. of Texas MD Anderson Cancer Center
Animal Diversity Web
Animal Physiology Study Guide - site of questions and answers about topics in Comparative Animal Physiology
Animal Resources from Sea World
Atlas of the Human Body - from AMA
Biochemical learning resources
BioMedNet - Search biological and medical journals.
BioSites - Current listing of important Internet resources in the biomedical sciences
BirdNet
BirdSource
Carnivore Preservation Trust
Cell Biology Hypertext Book - MIT site.  Good cell textbook information. 
CenTex Naturalist   Nice collection of  microsopic images - Bell Co. TX.
Crocodilians - Natural history and Conservation
Ethnobotany - Cultural use of plants in North America (great introductory site)
Evolution: Theory and History - Information on scientific study of origins (UCB)
Frog Guts  - Animated Dissection of the Frog.  Excellent Site!
Fish Information Service (FINS) - archive of information about aquariums. Covers freshwater and marine, tropical and temperate.
Harvard University-Biology Links
Human Body Online - anatomy of human body
Human Genome Project - identify genes and everything related to them
Invertebrate Biology Links - TAMU-T  - great resource for identifying invertebrates
ITIS - Integrated Taxonomic Information System  - USDA Great Scavenger Hunt Site
IUBMB Nomenclature - Recommendations for biochemical and organic nomenclature
Marine Science Databases on the Web
Mendelian Genetics Hypertextbook
Microbes.info - Microbiology Information, super resource
MIT Enzyme Biochemistry Hypertext Book
Monarch Watch - Research project to promote the conservation of Monarch butterflies
Ocean Planet - from Smithsonian- information about marine biology
PBS Resources - number of informative documentaries from PBS. 
Photosynthesis Hypertextbook
Powers of Ten - Virtual Microscopy - from a proton to 10 million light years from Earth! 
USDA Nutrient Database - Excellent Dietary Database - Very comprehensive.
Texas A&M University - Texarkana Biology Department
TC/TAMU-T Library Online References  Great resource page
TSIP- Texarkana Pre-Service Science Improvement Project
TAMUT- BSC 466 Evolution Course Page
The Bear Den - useful information about bears.
The Biology Project - Problems sets and tutorials
The EMBL Reptile Database
The microbe zoo
The Raptor Center - international medical facility for birds of prey
The Visible Human Project
Tiger Information Center
UC Berkeley Museum of Palenteology
Understanding Gene Testing
Understanding the Immune System
Urban Legends Reference Page
Virtual Anatomy Project
Virtual Frog Dissection
Virtual Microscope - magnifications of tissues and organs
Visible Embryo Project
Virtual Pig Dissection - Super review of the pig from Whitman College
Wayne's World - Great site for information on plants i.e. scavenger hunts!
Web Pathology - The internet pathology lab.
TC Biology