Android is typically associated with smartphones more than anything else. There are netbooks out there that you can get with the Os and a bunch of tablets are coming that will run Android.
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If you already have netbook, notebook, or desktop Pc and you would like to run Android on the machine you can if you follow the instructions for installing it over at How-To Geek. You can install from a Cd or a flash drive/memory card.
If you use the flash drive/memory card version, you need at least 256MB of storage space. The downside is in testing the publication reports that the webcam and WiFi card didn't work.