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I've used jailbreakme on quite a number of iPhones and it works great. I've never tested it on an iTouch, but that's the method I'd suggest. Plus they just updated it yesterday so it works even better.
Try googling winSCP, putty, cuteFTP, some are Mac some are windows. you install them on your computer then get your touch's ip address then you should be good. Again I have not done this before, some maybe someone else can better explain.