Works same as using the dock, except no power needed.
Here is what I did.
1. Tablet off.
2. Plug in adapter to tablet and ethernet.
3. Power on tablet.
4. Run terminal emulator.
su <- switches to power user
netcfg eth0 dhcp <- enables ethernet adapter using dhcp
setprop net.dns1 192.168.1.1 <- sets the DNS server to my router's address, you need to substitute by your own router's address.
I have found a couple of issues with ethernet connectivity, one of them being that when you try to download something from the market, the download seems to start and just hangs at 0%. Not sure why this is, but I'm afraid that the download process might be trying to use the WiFi adapter...just my guess.
Hope this helps.