調べものはまずGoogleへ
http://www.google.co.jp/

Java 2 Platform, Micro Edition (J2ME)
http://java.sun.com/j2me/
Reference Documentation(仕様書やAPIリファレンス)
http://java.sun.com/j2me/docs/
J2ME Wireless Toolkit
http://java.sun.com/products/j2mewtoolkit/

EZアプリ技術情報
http://www.au.kddi.com/ezfactory/tec/spec/ezplus.html
Vアプリ技術情報(Vodafone Developers Support Site)
http://www.dp.j-phone.com/dp/