Potential Uses

AntInstall is clearly designed for creating installers with Ant, but due to the flexibility of Ant it can be used in other situations too.

Scripting updates
If you wish to script changes to a system, AntInstall could be used to provide a GUI so that users can run the script, select the location of thier intallation, enter validated text options, and then let Ant perform changes to the files in the location selected.

Instant GUI
AntInstall can be used to quickly generate a GUI app for arbitary Java process that requires some user input prior to running. Create an antinstall-config.xml file write a small ant script, and potentially for more complex applications write some Java and add in the Ant script a <java> tag to run your code.