http://www.miamisci.org/af/sln/phases (an element chamber - see materials change with temperature changes)
http://www.chem4kids.com/matter/index.html (all about matter)
http://itl.chem.ufl.edu/2045_s00/lectures/lec_f.html (visual explanation of phases of matter)
http://www.brainpopjr.com/science/matter/solidsliquidsandgases/preview.weml (movie on solids, liquids, and gases)
http://www.chem.purdue.edu/gchelp/liquids/character.html (moving models of solids, liquids, and gases)