Thinking Blocks

Reading a Blog called Tumbl'n Teachers today I saw a great site for teaching a visual approach to algebra word problems. And a bonus is that it would be interacitve for the Interactive White Board (IWB). It is flash based and there are some problems done already on it, or you can create your own problems. There is a video tutorial if needed. http://www.thinkingblocks.com/Index.html
Check it out.