I had an ati tv wonder usb which was usb 1.1. Man it wasn't worth the money. The video was very jerky and the sound suffered also. From what I read usb 1.1 just doesn't have enough bandwidth.
I would reccomend that you buy an usb 2.0 and use it until you decide to buy a usb 2.0 pcmcia card. They make those don't they? Anyhow it should work with your current usb connection.
Edit: I just read your sig. I was in Pohang for about 45 days in 1986. I was there for team spirit. Do they still have that exercise?