"The success of companies like Google, Facebook, Amazon, and Netflix, not to mention Wall Street firms and industries from manufacturing and retail to healthcare, is increasingly driven by better tools for extracting meaning from very large quantities of data. 'Data Scientist' is now the hottest job title in Silicon Valley."
– Tim O'Reilly
Although, I should note, that this quote (by Tim O'Reilly) is on the O'Reilly store page where they are selling Data Science books, which is very convenient :)