I came across a great resource for teachers who use SMART boards. It's called Studyladder, Studyladder is a site with all sorts of leveled "interactivities" for you to use in your classroom. Math and language arts are the most represented, with dozens of activities each, but science, music, and art activities are included, too. In addition to the whiteboard-friendly activities, you can get worksheets and printables for student use. Studyladder is intended for students in grades K-7, as far as I could see, but some of the activities would likely be appropriate for 8th graders as well. I suggest registering your free account and checking it out; it might be the perfect tool for the last few weeks of school!
Great SMART Board Resource – Studyladder