well i revisited this issue in the last week or so... A new work colleague told me that he was able to use a software-mod to install a basic linux setup, then he was able to install XBox Media centre (i think he also upgraded the bios to latest Evo before hand - ftp/telnet to the box and install, rather than actual mod-chip)...

There a few guides of soft-mods with 'Save Game' data from MechAssualt/SplinterCell... only stumbling block is xbox dashboard model number, ie this only works for models less than v1.6

I agree the Media Centre software is a great package, and with wireless network (bridge AP), i would be able to stream anything to the xbox/home theatre.

I'll keep u posted