This Thinkquest project uses animations to illustrate the physical processes of rivers. Students can explore case studies and trail a river from source to ocean to see patterns, features, and landforms. Online lessons with worksheets and a quiz are also available. This site teaches English as a second language in an interactive format. Visitors can track their progress after they take a placement test to identify strengths and weaknesses.
Core lessons are free.
The Artchive is a useful collection of articles and some 2,300 scans of art images by more that 200 artists. You can also search if you're looking for specific information. The Kodak Picture Playground is a great place to manipulate digital images. The site lets users upload images from their local computers or the Web to the Kodak site and then play with them using online tools. The site is backed by useful links to information on using digital cameras and creating digital images.