Google Maps API Key

type this in the command prompt
           keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -validity 10000

follow the setup entering password etc. this will generate keys which are valid for 10000 days.

if the setup dose not proceeds check your environment variables..........

then type this in the command prompt

      keytool -list -alias alias_name -keystore my-release-key.keystore

 prompt will display the MD5 certificate
fingerprint

Go To The 

http://code.google.com/android/add-ons/google-apis/maps-api-signup.html

now you have an key to sign your applications