Android is not just an operating system for mobile phones and it's likely that it will be used for netbooks, ultra-portable laptops which started to become popular last year. Daniel Hartmann managed to install Android on an Asus EEEPC 1000H "with nearly all of the necessary hardware you'd want (including graphics, sound and the wireless card for internet) running". It's also interesting to see that some Android code references Asus Eee 701, the first Asus netbook.
VentureBeat speculates that we could see the first netbooks preloaded with Android in less than a year, but Android could become a general-purpose operating system for any kind of devices. Installing apps for your car or TV is not too far fetched.
This post details how to install Android on a netbook, but you shouldn't try it unless you understand the process.