Ok, I have finally managed to pack up the pages
Installation instructions, very quickly

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1. Setup apache+modperl+ssl
2. unpack
http://www.mosehansen.dk/dom-hosting.tar.bz2 in cgi-bin, or a subdirectory thereof
3. copy dom.css to some suitable place, like htdocs (must be accessible, e.g. as /dom.css
4. Setup db:
4a. mysql -u root -p
4b. create database dom3
4c. grant ALL on dom3.* TO dom3@localhost IDENTIFIED BY PASSWORD "498fDj398d";
4d. quit
5d. mysql -u dom3 -p dom3 < dom.sql
5. copy dom2host.conf.template to dom2host.conf and adjust usernames, password, roots and whatever you think appropriate
6. fire up pages. Create yourself as a user.
7. Make yourself root:
7a. mysql -u dom3 -o dom3
7b. update player set group_name = 'root' where player_name = 'myname';
7c. quit
8. Find out how to install the key. I think it goes into "(null)"/dominions3/key", but it's a bit hazy now.
It is also useful to know that the games leaves a game_name.log file with everything the game outputs and more. You might want to delete these occasionally, too, though I never bothered to.
From there, everything should be peachy. When something goes wrong, feel free to ask me
Gandalf: Login? To where?