The guy won't tell you his secrets? Hmm, well, i guess I'd understand if he created everything, but all those hacks have detailed tutorials. So, here is some free info and help
For a multi game menu, for you, i'd suggest a plain, non-fancy, evolutionX game selector. It is meant as a replacement dashboard, but works just as well as a game menu.
Anyways, get a program called "evolution x", it is what sets up the xbox for network connection. Then you connect to it with an ftp app (windows and internet explorer work, but I wouldn't suggest using them). Flashfxp is the most common as it seems.
I have a small tutorial site in my sig, or go to
www.xbox-scene.com for more detailed, but less picture oriented tutorials.
For the mutigame menu, evoc is very very easy to set up because no work is really needed. After you get everything ready, we'll help you with that.