Time For Kids is a great source of information for kids to keep up on current news stories. They cover the US and around the world. They feature kid reporters and have a homework helper section.
This site provides many writing lesson plans. It also gives many computer interactive prompts, and gives children the chance to share their writing online.
This site provides a huge database to access art. It can be searched by artist, specific topics, or curriculum based. It also has many different lesson plans to accompany the art.
3rd graders in the Millard School District are required to learn about the Omaha Indians. This site shows photographs, artifacts, and gives first hand information about the local tribe.
This website, funded by the U.S. Department of Education, has a plethora of resources available to help parents and teachers looking for resources. One of my favorite parts to use in the classroom was the section of videos from many different authors. These would be great to use for an author study, lesson, or just to enhance a book the students enjoyed.
This is a great site to help enhance an Earth Science unit. Students can get first hand information from NASA in an easier to read format. One thing I particularly loved was their explanation of air pressure. This has always been a difficult topic for me to describe.
This is a great, easy to navigate site. It includes many aspects that would enhance our 3rd grade curriculum, such as communities, branches of the government, and how laws are made. It puts these in an easy to read format, and if you have struggling readers or vise versa, they can read the corresponding section from a different grade level.