One of those Sonnett PDS upgrade cards that combined an accelerator with an ethernet adapter? If so, very nice.
Yessir!
Like Luddite, I'd start off by looking at Netatalk. If that doesn't deliver the goods, don't worry too much. You can't generate masses of data on a 68K Mac, so an external hard drive or CD burner is a cheap alternative.
I'm not worried about generating data, I'm worried about having the space to store all the games I downloaded. Also, I'm fairly certain the 10mbps network connection will run circles around the internal SCSI drive, not to mention seek times.
Plus, being able to access the loads of media I have on the server would be great. 22khz isn't too great for music, but I think after the upgrade, playing 24kbps talk radio mp3's wouldn't be too bad at all.
Thanks to everyone for the responses, I'm going out to get floppies right now. Hopefully everything will work ok.