The Iliad has a user forum (Irex technology)
http://forum.irexnet.com
and on there you will find some notes on a replacement PDF reader which does away with the buttons on the bottom, thus enabling a Jepp plate to display over the entire screen height. I have not installed this yet - don't know how to (it's a weird unix device).
The American packaging of the Iliad uses some fairly crap software and actually the standard Iliad browser is quicker to use. You need to create a directory structure (country/airport/files-list) and then the built in browser works well.
IMHO the Iliad has the greatest potential of all products right now, for a straight Jepp plate display device. With the latest firmware it has a ~9hr battery life and due to negligible power consumption it doesn't get hot. But it will never work as a moving map GPS etc.