The next release of the IzPack-based GlassFish installer will bring the following enhancements:

1. Solaris (x86, sparc) support
2. ability to tweak the default domain creation (uses UserInputPanel, see the screenshot above)
3. ability to start the created domain and open a web browser on the administration console
4. support for creating the domain with the cluster script.

Note: the data entered on the above panel is validated

I have yet to test it on other platforms than Mac OS X (Tiger), so feel free to try it from http://izpack.org/showcases/glassfish-v2/experimental-glassfish-install.jar and report issues! (as the name suggests, this is highly experimental)