I switched my machine to real IP from our 192.168.x.x but then my transfers from our file server stunk. So I found these 10.1 drivers on VersionTracker. Most of the cheap $10-$15 ethernet cards use the rtl8139c chipset. I found both D-Link DFE530TX+ and the SMC1244TX. I got a D-Link for $10 with a $10 rebate at a local store. Installed the card and ran the driver package. Worked perfectly first try. I guess gone are the days of "Mac Only" hardware. I'm thrilled. An easy way to tell if a card will work is look at the linux drivers, if they are rtl8139, you're set.