One of the criticisms that’s been labelled at Google’s Android mobile operating system is that it isn’t as consistent and integrated as Apple’s IOS. To counter that, and to make life a little easier for developers (and eventually users), Google has introduced an Android style guide. As you might expect, it’s a very nicely laid out web site.
If you want to read more about it, Wired has an interview with lead Android developer, Matias Duarte.