I often forget to keep a copy of my current adom.kbd somewhere, and—as I use vi / Crawl keys—it can be a painstaking process making sure everything gets reassigned properly.
To make it easier to figure out what's used and what's not used, I colorized the default layout using some tool called Keyboard Layout Editor. I figure they may be of some use to other people.
The images are split into lowercase, uppercase, ctrl modifier, alt modifier, colon modifier, and w modifier. As the board only allows 5 attachments, you'll have to download them as a zip file. Lowercase is included in this post as an example. There's no legend as such; the red-ish indicates a key that's used, the greenish-yellowish hue (sorry—I'm color blind!) is a modifier, the light blue-ish indicates a modifier key that you should avoid at all costs, and the lighter red-ish hue found in the Ctrl modifier image just indicates Ctrl+n+m (I didn't feel like making another file for all the Ctrl+n bindings).
(note: calling adom.exe from the commandline with options '-r' or '-k -r' will supposedly create a keyboard reference file, but I couldn't get this to work on Windows, at least)