I had the same problem and can verify that the Adaptec USB2connect PCMCIA card (AUA-142OA) works like a charm. It provides two USB 2.0 outlets, which allows for both the 5G iPod and also new EyeTV hardware to work. This allows me to put TiVo'd shows on my iPod with relative ease.
DO NOT USE the Adaptec card with the two USB ports, the firewire port and the other tiny Sony firewire port. Even sticking it in your PCMCIA slot will cause the computer to COMPLETELY SHUT DOWN. In other words, DON'T use this one:
http://www.compusa.com/products/productinfo.asp?productcode=314360
DO use this one:
http://www.compusa.com/products/productinfo.asp?productcode=314362
I have an older version of the Adaptec USB 2.0 card that I used with a graphics tablet, and it worked great too. Frankly, I was stunned that my Powerbook had only USB 1.1 slots, but whatchya gonna do.
I was tempted to try the COMPUSA brand USB 2.0 card reader, as I think it was only $19.95. Perhaps someone out there might like to experiment - if it works, that's insanely much cheaper.