Lets try skillgun.com for some more interesting questions

Here are sum Links too related to Your Query :)

http://www.indiabix.com/hr-interview/why-should-i-hire-you/

http://career-advice.monster.com/job-interview/interview-questions/why-should-we-hire-you/article.aspx

http://www.interview-made-easy.com/2008/07/hr8-why-should-we-hire-you.html

Hope That will help too :)
Thanks.

Hi Agnik, You can tell them ' Because you the are perfect one for the job' be confident & not arrogant. Prove your skills & make them realize that you are the best candidate for the job.'

Some more Mentors have answered the similar kind of Query. Here are the links. These might help you to solve your query:

http://www.firstnaukri.com/qna-hello-sir-i-had-just-given-a-interview-in-a-company-named-craftpowercon-in-interview-round-interviewer-asked-me-why-should-i-hire-you-i-had-given-1004919.html

http://www.firstnaukri.com/qna-hi-sir-i-am-pgdm-marketing-fresher-how-should-i-ans-to-the-question-why-should-we-hire-you-for-the-sales-profile-in-an-interview-please-suggest-1001923.html

http://www.firstnaukri.com/qna-why-should-i-hire-you-1003910.html

Hope that solves your query,
Feel free to post more queries,
Thanks and Best of Luck!!