I've been playing around with various bits of the Java Enterprise System.
It comes on a neat DVD in the Solaris 10 media kit. So I had a play with that at home, only to discover that it's missing one thing. Instructions. There is no documentation included. Zilch. Nothing.
The basic instructions can be found on the web, but that's not the point. It's a fairly small pdf file - about 4 megabytes, and there's plenty of space on the DVD to fit that in all the supported languages. It would make it so much easier for people to test.
Another useful document I came across is a useful guide to evaluating JES on a single system. (This would also be absolutely easy to simply copy onto the DVD.) This covers the basic steps you need to get started.