David vs. Goliath
The ancient tale of David's victory over the mighty Goliath has become a symbol of how smaller competitors can rival larger ones using intelligence and determination. The story has repeated itself time and time again in the tech industry--think Microsoft and IBM, Google and Yahoo, and Facebook and MySpace.
Today you can find numerous upstarts rivaling their larger competitors. Here's a look at 15 interesting David vs. Goliath-like tech shake-ups going on right now.