I listed WolframAlpha back in July of 2009. Things have been moving along with this wonderful tool. I have an app on my iphone which recently they reduced from $50 to $1.99 which was an interesting marketing move. It can also be downloaded for the ipad. If you watch the introductory video you we get an excellent idea what can be done. I just wish educators in Elementary and Secondary schools were taught how to integrate this into their curricula. Here is a link to the video, enjoy! What do you think?