Web apps:

Discovery Education at http://www.discoveryeducation.com/

Khan Academy at http://www.khanacademy.org/login?continue=/postlogin%3Fcontinue%3Dhttp%253A//www.khanacademy.org/&direct=1
(It's worth noting that student login accounts are a breeze with our district MBUSDAPPS.ORG google for education account.
Contact Jeanne Reed or Christina Lee)

IXL Math at http://www.ixl.com/

iPad apps:

BrainPop and BrainPop Jr. (some free movies but a subscription is best)
Star Walk