What can I read on the Web that will teach me the ins and outs of Android?

I’m planning on getting an Android-based smartphone soon and I’d like to know how to use the operating system well, not to the extent of becoming an application developer, but at least to be an expert user. I searched Google for Android users guides and such but haven’t found anything that’s been informative and also fun to read. A book would be okay but I’d prefer some online sources that are very up-to-date. My phone will very likely run 2.1 or 2.2.