I think both of these items would be able to be used by the students also. The Visual Presenter allows you to project a pretty large image, so they would be able to project their artworks for the class critiques. This would again, give the whole class a better view of the piece. The Wireless Tablet could also be used by students and the teacher to point out the particular critiques that the classmates and teacher may have about the work. I think it would add to student participation because it would make the critique more interesting with the added interaction the tablet creates.
I know there are similar technologies that perform the same job as these do, but I always think it is important as a teacher to be aware of the many different possibilities that are available to enhance our teaching as well as our students learning experience.