Our entire industry is scared witless by Google's dominance in search and advertising. Microsoft and Yahoo have been unsuccessful at staunching the bleeding of their search market share. VCs parrot the Google PR FUD machine that you need giant datacenters next to hydroelectric dams to compete. They spout nonsense about how startups should just use Alexa's crawl and put some ajax on top of it. Ye gods.
Grow a spine people! You have a giant growing market with just one dominant competitor, not even any real #2. You're going to do clean-tech energy saving software to shut off lightbulbs in high-rises instead? Pfft. Get a stick and try to knock G's crown off.
...A conventional attack against Google's search product will fail. They are unassailable in their core domain. If you merely duplicate Google's search engine, you will have nothing. A copy of their product with your brand has no pull against the original product with their brand.
Duplicating Google's engine is uninteresting anyway. The design and approach were begun a decade ago. You can do better now.
Forget interface innovation. The editorial value of search is in the index, not the interface. That's why google's minimalist interface is so appealing. Interface features only get in the way.
Forget about asking users to do anything besides typing two words into a box.