"Bet on technical insights, not market research. Product leaders create product plans, but those product plans often (usually!) lack the most important component: What is the technical insight upon which those new features, products, or platforms will be built? A technical insight is a new way of applying technology or design that either drives down the cost or increases the functions and usability of the product by a significant factor. The result is something that is better than the competition in a fundamental way. The improvement is often obvious; it doesn’t take a lot of marketing for customers to figure out that this product is different from everything else.
For example, at that time Google was experimenting in applying some of our expertise from online advertising to other advertising markets, including print, radio, and TV. These were clever efforts, supported by smart people, but they lacked that fundamental technical insight that would shift the cost-performance curve non-incrementally and provide significant differentiation. All three ultimately failed. And when we look back at other Google products that didn’t make it (iGoogle, Desktop, Notebook, Sidewiki, Knol, Health, even the popular Reader), they all either lacked underlying technical insights from the outset, or the insights upon which they were based became dated as the Internet evolved."
... and other bits of wisdom from Erich Schmidt's "How Google Works" http://max2c.com/how-google-works-by-eric-schmidt-notes/