There's already been a few threads on the subject and at least one wiki page.

http://wiki.maemo.org/Remapping_keyboard

If that's not enough, search for some threads on the subject. If you don't know the code for a specific xkb key, I'm sure there's a few places you can find it, but I had the most luck with this:

http://cgit.freedesktop.org/xkeyboar...ree/symbols/us (Scroll around, pick out the ones you need/want. Yes you'll probably have to look up the names of characters you want if you don't already know them. Deal.) Actually, you don't have to use the "us" keyboard reference sheet. If you go one directory above that in that link, to "symbols", you'll have a bunch of different ones you can poke around in.