Yes, it will work just fine. I don't recall it needing any special drivers, but if it does you can download them from Sonnet Tech. I have one in my beige G3 running OS 9.x, and it works well. The only caveat is that there are no USB 2 drivers for OS 9, so the USB 2 ports will only run at USB 1 speeds (max of 12Mbps).

You should do a little more research before you buy that card, though. Sonnet marks it as compatible only with Windows. The card would need to have Open Firmware ROMs/firmware to be fully Mac OS compatible, so you might not have success with that card. I know from personal experience that Sonnet used to make a Mac-compatible card, though. Maybe eBay?

Peace,
Drew
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Power to the PowerPC!