I know AdMob is not for Java ME. Do you know any other advertising API or services that can be used in Java ME application?
It might be really good if I can earn some money with my free Java ME applications.
http://adfonic.com/ Adfonic is what can I find now. You can follow it's instruction from http://developer.adfonic.com/index.php/Getting_Started to allow mobile advertising from Java ME application.