My class is studying matter, so it seemed like a good idea to look for a flipchart that would be both informative and fun.  This flipchart involved selecting matter and catagorizing it as either solid, liquid, or gas.  It also had a neat thermometer with which one could change temperature so as to reveal both the freezing and boiling points.  The class was very engaged and especially loved the interactive parts of the flipchart.  I'm anxious to find more flipcharts for instruction and review!