Feel free to share a website you found that includes good app suggestions here.
Apps for Common Core Math Standards, Grades 9-12
http://www.techlearning.com/Default.aspx?tabid=67&EntryId=3505
APPitic - directory of apps for educators by Apple Distinguished Educators
"With Just One iPad, Teachers Improve Classroom Lessons"
http://www.marketwatch.com/story/with-just-one-ipad-teachers-improve-classroom-lessons-2012-01-04