The Cornell Lab of Ornithology is a world leader in the study, appreciation, and conservation of birds. This site lets you search for different species of birds and learn interesting facts about them, watch cool videos, and explore everything you wanted to know.
What do you want to be when you grow up? If you blurted out "cheese scientist!" then you would enjoy the Cheese Science Toolkit. This site is a guidebook for those curd nerds who have a special place in their heart for cheese. Many posts focus on particular cheese science topics such as how different cheeses are made, the flavors, chemical makeups, pasteurization, and cheese experiments.
CAST Science Writer is a tool that supports students in writing science lab and class reports. This tool is geared toward middle school and high school students. All parts of a science or lab report are broken into small steps so the author can concentrate on one part of the report at a time.
Species: Artificial Life, Real Evolution is a scientifically-accurate natural-selection video game. It allows you to experience evolution first-hand, simulated from the principles of evolutionary science: variation, mutation, and natural selection. The game is still in development, but an alpha download is available for free.