Virtual Manipulatives
Manipulatives: http://www.glencoe.com/sites/common_assets/mathematics/ebook_assets/vmf/VMF-Interface.html
Manipulatives: http://eduplace.com/kids/mw/manip/mn_2.html
100 Chart - Splat: http://www.oswego.org/ocsd-web/games/splatsquares/splatsq100.html