I’ve heard good things about the Canopus products as well although I don’t own one. I have a Pinnacle Deluxe card and, while it does a great job, it does require that you use Pinnacle Studio 8 software to capture. I just purchased an ADS Pyro A/V Link and cannot recommend it. It drops frames for no apparent reason when capturing analog. I’m thinking of checking out the Canopus products myself next.
Ive heard those give problems with the capture, especially under USB1.1. You may want to look at a firewire PC Card instead of USB.
Ive also heard that laptop hard drives are too slow to capture without issues at times. most laptops have 4500-5400 rpm drives. Most video oriented desktops have a seperate dedicated drive that runs 7200rpm or even 10000rpm.
Now keep in mind that these two issues are more important when you are doing pro level editing and capture. If you are just making home movies for fun and entertainment, then one of the many entry level USB devices will work