One last website I like is www.coolmath.com. It works for the most part on an iPad but the games do not work because they require flash. Otherwise, the cruncher or practice problems work pretty well. This site has some good material in it. Tomorrow I am going to send my 9th graders to read up on prime numbers and prime factorization. The prime numbers section has the Sieve of Eratosthenes in the definition. I think I will provide an unmarked one for them to do along with the explanation.
Over the summer I am going to try to put a syllabus, homework and class info on the school wiki so come fall, I can just send students there to download information and check on assignments etc. I just found out one of the teachers who runs an afterschool activity, uses Edmodo to communicate information, dates, etc to her students. I need to further explore this option further.
One thing I need to consider as I do more things on the iPad has to do with keeping student work safe. I have one set of iPads which are shared among all my classes. I have to research how email works on the iPad to see if my students can keep their privacy. I have an idea but I need to pursue the idea further.