This post was created by my e-friend Kate Ahern. She wrote it for her students who are disabled, but it has a lot of useful and interesting apps for iDevices. Many are low-cost or free, and would be an addition to a device to while away the time, for example when waiting for a sibling to finish an activity.
Virtual Manipulatives for Math
PS: I suggest checking out the rest of her site, as she has many useful posts.
