Once you get through the overwhelming Dell ads, this site includes a variety of resources for educators. Blogs, Best Pracitces, Grant Opportunities, etc.
BrainPopJr is an extremely engaging website that provides games for students in all subject areas. It is easy to differentiate. It also gives many teacher resources which can help link this material to the traditional curriculum. Trial available.
On-line resource to create diagrams and graphic organizers. Free to use; registration required. Teacher and student friendly. Recommended uses: water cycle, rock cycle. Relatively easy to use. On-line save option. Can edit simultaneously from remote sites (real time collaboration).