As others have said, the emulator starts up very, very slowly. It can be wedged into a startup for me from time to time, but closing it and trying a second time almost always works. And yes, you can leave it working all the time, but note that Eclipse and / or ADB can also be jammed. In Eclipse, you will see the logcat update. I can usually restart it by doing
adb kill-server adb start-server
Sometimes just executing the adb log code on the command line will again lead to a move. Good luck.
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