Google is huge. But sometimes its easier for them to just buy smart companies out there rather than built it from scratch. And when you have so much money, that makes things easier for Google.
TechCrunch reports Google is "acquiring around one company per week," according to bossman Eric Schmidt. They've already acquired 57 companies this year, all to the sum of $1.4 billion. Some of the major purchases include Zagat, and some subtler ones include airline data firms for travel services.
At this rate, everything's going to be owned by Google.