<if you know of an adapter that does/doesn't work, you should post it here>
Linksys USB300M works (uses ASIX AX88772 chipset)
Apple USB 10/100 Ethernet adapter (ASIX AX88772) works fine
Plugable USB 10/100 works (another ASIX AX88772 based adapter).
If you have DHCP running on your router, you can just run dhclient eth0 to get going
You'll need to remount root so that dhclient can edit it