Volume

Brain Pop - Volume of Prisms - http://www.brainpop.com/math/geometryandmeasurement/volumeofprisms/

Illuminations - Cubes -
http://illuminations.nctm.org/ActivityDetail.aspx?ID=6

3D boxes -
http://www.interactivestuff.org/sums4fun/3dboxes.html

Shodor Interactive -
http://www.shodor.org/interactivate/activities/SurfaceAreaAndVolume/

Interactives - 3D Shapes -
http://www.learner.org/interactives/geometry/3d_prisms.html