Consider former Google ally Apple (AAPL), which has dominated add-on businesses (music players, retail) that are more profitable than the one that brought it prominence (computers). Apple is just killing it, and it is now the most valuable technology company in the world, with a market cap of $236 billion vs. Google's $156 billion.
Google says some 160,000 new Android devices are activated each day, and device makers from Motorola (MOT) to HTC have all released popular phones on the Android platform. But Google doesn't make gobs of money on those devices. (Google dabbled in phones but discontinued its Nexus One after only six months.) Apple, on the other hand, also stoked the smartphone market with its iOS, but with very different financial results: Last year the company posted an estimated $15 billion in iPhone sales, a benefit of making the hardware and the software.
http://tech.fortune.cnn.com/2010/07/29/google-the-search-party-is-over/