Hello Lana! My name is Lisa Krueger and I am a Khan Academy Ambassador teaching in Chicago. I have been using Khan Academy as  tool to help my students fill in the gaps in their mathematical knowledge as well as review grade level skills. I created a bulletin board to spotlight student successes on a weekly basis based on goals set such as: most skills mastered, most videos watched, most badges earned, most minutes active, highest percentage of mission completed, etc. Hopefully you will get many more posts explaining how Khan Academy is used in different classrooms. Please let me know if you have additional questions, comments, or suggestions. Thank you for posting and Good Luck!