If you're the type of Android user who has the SDK stashed on your computer (and let's face it -- if you're reading this, chances are you do), then know that Google has updated it to be in line with the version of Android 2.2 that was released to the Nexus One last week.
For you more common folk, now might be a good time to take a look at installing the SDK (see Jerry's walkthrough here). Why? You're probably going to need it if you want to root your phone, take screen shots or follow along with whatever other hackery we might be talking about on a given day. It's quick, it's easy, and it's available here. [Google Developer blog]