Anyone who has dealt with Java professionally knows how crazy editing the CLASSPATH can get When you deal with multiple programs and libraries, other environment variables can cause quite a bit of problems as well. PathEdit is a visual interface designed to try to alleviate this situation.
PathEdit will scan your environment or allow you to open a batch/shell file. From there, you can visually edit anything it recognizes as a path string. You can move directories and files up and down, add new items, delete items, etcetera. At all times the directory items on your screen will show whether they exist or not. When saving it will respect the original lines of the program and only change the paths you modified.
PathEdit is written in Java Swing. To execute, simply run "java -jar pathedit.jar"
This is free software under the General Public License (GPL), so please download the source, build it, and start hacking!
This link will take you to the sourceForge files system from where you can download the path-edit JAR.