There's one card, I believe it's a Sonnet Tango 1.0 or 1.1 that has FireWire 400 and USB 1.1. It's really awesome to have both. The COMM riser card for Ethernet capabilities are seriously impossible to find. Any time I find one I pick it up. 

I found a TAM, in the Bay Area, on CL that was in the box, unopened, and had the original receipt it with. He was selling it for 650. I had to snatch it. It was opened, and I'm cool with that because I wanted to remove the PRAM battery. 

I love the TAM's probably my second favorite Macintosh.