Houghton Mifflin Harcourt, a major textbook company, has launched a year long pilot project with the HMH Fuse: Holt McDougal Algebra 1 full year algebra course on an iPad. The course mirrors all the content of the Holt McDougal Larson Algebra 1 2011 textbook currently being used in many schools.
http://www.tuaw.com/2010/09/14/hmh-fuse-calfornia-tests-a-full-year-algebra-course-on-an-ipad/