I\'m working with some sample code here:
http://code.google.com/p/google-api-java-client/source/browse/picasa-android-sample/src/main/java/com/google/api/services/sa
I believe if you go to https://accounts.google.com/IssuedAuthSubTokens it should list your application under "Connected Sites, Apps and Services" from there you can revoke access.