well davis,
J2ME like jdk 1.3 is a set of tools and APIs for developing applications for various devices, other than PCs. These devices can be divided into two categories: those that can communicate without any physical connection (like PDAs, cell phones, pagers) and those with a physical connection (like ovens, refregirators)
J2ME specifically addresses the need for application development for both categories, through its Profiles and Categories.
where j2me differs from jdk is that the set of APIs are limited and different and the JVM (here, the KVM) implementation is also different. This is due to the fact that such devices have limited memory and bandwidth.
if u r interested, u can check out sun's site at:
http://java.sun.com/products/j2me or if u already have the reference implementation, u can startoff with some tutorials at:
http://developer.java.sun.com/developer/technicalArticles/wireless/palm/ regards,
esh