I have uploaded a zip file to rockstarapps.com that has all the
functionality to do CSS and JavaScript optimization through an ant script.

http://www.rockstarapps.com/downloads/ant-optimization.zip

Developers can now access the optimization functionality that is
supplied by the jsLex Eclipse plugins via ant. The download includes
all the files necessary to optimize your resources and a sample
application and build file. This is the first version of the ant
build, if you find any issues add them to the jsLex Yahoo Group.