1) I think YouTube is a valuable tool in the wealth of visual demonstration of science concepts. At the beginning of a new section of material, I will have students find various videos of the science topics currently being covered to share with the class (but topics must be new and not stated in textbook)
2) Technology is the way students communicate and see the world so in order to really reach them, the material needs to be presented in their language, via digital tools. Homework and projects need to be transformed to incorporate technology. As this happens I believe teachers will see an interest and more vested approach to the students' schoolwork.
3) The user-friendliness of the tools was really nice. Using the various tools such as Twitter and imbedding videos from YouTube is actually very simple and something that can be injected into a lesson very easily in order to liven it up and generate interest from students.