I don't have an ipad or an ipod touch myself, so I don't know much about apps yet. But lots of the folks on Living Math Forum are talking about how much fun the Dragon Box App is, and how much algebra their kids are learning from it.
Math Mama is Sue VanHattum, a community college math teacher interested in all levels of math learning, and the mama of a young son. I entered the blogging world as I began work on an anthology about learning math. Contact me at mathanthologyeditor on gmail etc.