Recently, I came across this site/service called Web Numbr which was quite interesting and cool enough to share it. Web Numbr is a service which can be used to track any numbers in the web and plot graph over the same. For example, you can track the stock quote of particular company say YHOO, plot a graph on the same data and all in 3 simple steps. First login with any Open ID. Second, Enter the URL of the page which contains the data you want. And as the last step, select the element on the page which has the number you want. You are done by now. You can also set the polling frequency. I started experimenting with it and created a graph for the number of followers for Sachin Tendulkar in Twitter.
Number of followers for Sachin Tendulkar
Graph showing the follower count of Sachin Tendulkar on twitter