If your Emulator doesn't show up in the Devices list...
Sometimes the Android Emulator that you just started up does not show in the Devices list in the DDMS Perspective of Eclipse. If that happens to you (like it just happened to me), then do the following in your command line to get it to show up:
adb kill-server
adb start-server
You should see this output:
* daemon not running. starting it now on port 5037 *
- daemon started successfully *
Then your Emulator instance should show up in the Devices list.
I'm not exactly sure why this happens, but it has to do with adb (the Android Debug Bridge) going into a bad state. The kill-server/start-server combo serves to reboot it and back into a good state.