So plugging in those pesky USB keys has got too hard for you? Try a wireless flash drive from SanDisk - http://www.sandisk.com/connect/
Two different configurations that can stream to multiple devices and offer up to 8 hours streaming.
A good rundown is at Computerworld - http://www.computerworld.com/s/article/9240944/SanDisk_unveils_wireless_flash_drives_that_hold_up_to_64GB