Mathletics has now joined the app world. You still need a log in and pay a subscription fee, but you can use this now on iPads and iPods etc. Not all parts of the program are accessible, some tasks are not flash free, but the majority are and my guess is they will keep improving it.
There is a teacher app and a student app - I know that our students are going to love this extra way they can interact with this online tool. 
