Ohio State University
Ohio State Univ.: Gymnosperms (Conifers & Relatives)
A review of conifer biology. Illustrations are great and help clarify the text, which can get a bit advanced for a general audience. A great resource for exam review.
Other
Real Trees 4 Kids
A very informative site that looks at the characteristics of conifers. Numerous links are available with information about cones, seeds, and needles. Other articles include current issues surrounding these trees.