Multi-user game information

I'm looking for any recommendations on books and/or tutorials on programming multi-user games. So far, I have found the book titles:

Macromedia Flash 5 ActionScript for Fun and Games

Flash Games Studio

Any reviews of these books (especially from the multi-user angle) or any other thoughts are most welcome.

Thanks as always to the FK Community.

-Monster.

Try Foundation Actionscript, by Friends of Ed. It has a big section dealing with games and how to make them, but not sure how indepth.