Eclipse - Yeah.
ADT - Android Development Tools plugin for Eclipse.
Accessible from within Eclipse, under Preferences.
SDK and AVD Manager - AVD = Android Virtual Devices.
Accessible from within Eclipse, under Window->SDK and AVD Manager, or by running 'android' from my terminal.
Emulator - Good ol' fake phone.
Start one from the AVD Manager. I think I can close the AVD manager after I've started up a fake phone. Yes.
|ADT eclipse plugin preference page|
|Android SDK and AVD manager!|
Also, applications with maps work better once an api key has been obtained (http://code.google.com/android/maps-api-signup.html) AND, for some silly reason, the 'custom debug keystore' in android build preferences filled in/set to the same thing as the default debug keystore. I had been getting this error in logcat over and over again, "MapActivity Couldn't get connection factory client", until I did those 2 things.