Interview Questions: Why should we hire you over another candidate?

Obviously if you're being interviewed it's because the company sees you as a solution to a problem they have identified. 
Relate past experiences that show you've had success in solving problem(s) that may be similar to the ones they are currently facing. Succinctly tell them what you bring to the table. What sets you apart from your competitors.

Compliments of David E Perry and Kevin Donlin. For more creative job search tactics, go to the Guerrilla Marketing for job hunters blog and download the free audio CD.