If Google's own documentation leaves you wanting, or is too developer-centric for you, there's only one place to go: Android FAQ - brought to you by android-dls.com. Holy crap, that's a lot of information. Sure, there's plenty of sections for developers, but you can also find out where to get accessories, learn to unlock a G1, and check out the available extended batteries.
Android Books
I can't say much about either of these because I haven't read them. But this blog post will give you an idea of what to expect (I hope). These are for developers, hackers, and other people who make my brain resemble tapioca in comparison. I figure if you're one of those folks, you already know where to find the best resources. But for those Android fans who are just starting out on the Path of the Programmer, this may be of use.
Feel free to let me know what I should include next time, or expand on/dispute my descriptions here in the comments. I know there are a lot of Android websites out there. I'm really not looking to list them all, so let's not use the comments for spam. If you think you have a comprehensive resource with original or diverse content, go ahead and link it.