Nope, thank Microsoft for that one. Technically you could but that would involve hacking the firmware, and possibly the hardware of the Xbox. Those ports are pretty much designated to controllers and nothing else.
Actually, I can plug in my flash drive and play music from my flash drive along with viewing pictures and whatnot.
It is too bad you can't SEND anything through there though.
At least you can use those compared to the ones on the PS2.
Right I forgot about that, but yeah its very deceiving to see those USB ports and think, hmmm those could be useful. Consider this, you can't even use a USB mouse or keyboard with them oh no, you have to buy an adapter, that's right USB to USB in order to use a mouse/keyboard.