karthikpalanivelu, if you really want this, I can really recommend Distimo (http://www.distimo.com/). You can very easily see how many of your apps have been downloaded or bought. You can see historic data about your apps. And that all on one page. I have some applciations in different mobile app stores, so a website that brings everything together is very welcome.
The first time you will have to wait about 24-48 hours until your results are loaded from the stores. But I can tell you now, that is worth the wait
A like is always appreciated, but a nomination for BB Elite even more :-) You can also contact me on Twitter: @ndsmyter