I\'m used to develop and debug android apps on my phone, it\'s pretty faster. When I\'m ok, I export a signed APK to upload to the market.
Now I use Google Maps APIs
I don't think you can do this via ADT directly. But you could use ant to build instead which supports signing (http://developer.android.com/tools/building/building-cmdline.html).
Just set the key.store, key.alias, and key.store.password, key.alias.password properties in the ant.properties file.
You can also trigger ant builds from within eclipse and add a new ant target to install/launch the app on your device