A few days ago I ordered a NES to USB adapter from RetroUSB.com , and it showed up in the mail today. I had it sent to the address in the USA I'm staying at this week to save on shipping. I also had the foresight to bring a NES controller with me so that I could test it out when it showed up. That said, it seems to be working like a charm.
I gave it a test on my laptop (running ubuntu 10.04) and after installing a few packages, got it to work as a generic joystick. Seems to be pretty good! Now, it might be my lack of practice, or my aging laptop, or the power setting mode, but I feel like there is the ever so slightest input lag. I'll have to check it out more because I suspect it isn't the adapter, but a combination of my laptop and the software that I was running.
Overall thought, I'm very happy with it! So far, I would definitely recommend their products.
On a more personal note, my flight to Boston went excellently. I'm still here (until Saturday) and having a great time. The people that I'm staying with have been very nice to me so far. I'm hoping that we have the time to go visit MIT and Harvard before I have to leave.