To start use:

java -jar CraftProxy.jar <port to bind to> <default server> <default port> [<password>] [verbose]

If your server is on the same server as the proxy and uses port 25565, you could use

java -jar CraftProxy.jar 20000 localhost 25565 somepassword

Players would connect using yourhostname.com:20000

Setup

mkdir src
cd src
git clone git://github.com/Raphfrk/CraftProxy.git
cd ..
mkdir temp
cd temp

Create this file:

javac.exe -cp "<path to Bukkit>/bukkit-0.0.1-SNAPSHOT.jar" ../src/com/raphfrk/craftproxy/*.java -d out

cd out

jar cvfm ../CraftProxy.jar ../../src/manifest.txt  *

cd ..

zip -r CraftProxy.jar . -i src/*.java

pushd ../src
zip -r ../temp/CraftProxy.jar . -i plugin.yml
popd