the only thing preventing these games from playing on xbox is the ram difference
aside from that, the things running pretty much the same as an xbox
by the sounds of it, its just a beefed up coin operated xbox

hopefully some looks inside the thing itself would reveal if it would be possible to upgrade a stock xbox to 512mb ram (same amount of chips, just bigger)
and just cause its on a gdrom doesnt mean that u cant use them
gdroms were hacked, u could theoretically replace that dvdrom, and pop in a dvdrom.. maybe play some retail xbox games on the arcade unit itself
to most people this isnt much at all.. and in a way it isnt, but its something out there to only open the door further to mods and new games
and that crazy
taxi (having played all crazy
taxis myself) is different...
hotd3 looks the same, as does virtua cop
and both of those have been in the arcades already
likely just replacing old sega arcade machines
and for all you n00bs, sega is a very high roller in the arcade business