I have previously blogged a few ideas for how you can use the iPad to make SPAG a little more exciting here.
See more videos from Flocabulary here.
Similes and Metaphors by The Bazillions -
See more videos from The Bazillions here.
Noun Town -
Grammaropolis have lots of similar videos that can be played here.
You can see more Grammar songs from Melissa here.
Verb Rap -