There are groups based out of South Korea and China that load flash drives and memory cards with news, interviews with defectors and TV shows from the Western world ("Friends" and "Desperate Housewives" are apparently favorites there). They then smuggle these to groups in North Korea, sometimes even floating them over the border by balloon.
Once the drives are in the country, North Koreans can use "notels," which are Chinese-made USB-compatible video players, or smartphones to view the content. Right now, around 3,000 to 5,000 flash drives are smuggled in every year, but groups like the North Korean Strategy Center want to get up to 2,000 a month.
If you have flash drives just sitting around and want to get involved, the Human Rights Foundation and Forum 280 have started something called "Flash Drives for Freedom." It takes any working flash drive you have.
The groups do wipe the flash drives before loading new content, however you'll probably want to do your own formatting first. Just plug your USB drive into your computer, go to My Computer, right-click on the drive and choose "Format." Tell it you want a full format. This takes longer, but is more thorough.
Does this sound like a project you'd be interested in helping out? Let us know your thoughts on this interesting idea in the comments.