Hey Walt,
Nice job. I got it to work without much effort even though I'm new to Arduino programming. I'm wondering if the Ethernet shield you are using from SEEED studio (same as mine) supports DHCP? I got it to work on 192.168.1.177 off my main router but I have a 10. 10.10.1 network that provides DHCP. I tried changing the address to 10.10.10.4 (which I know is available) but it will not connect. I suppose the Ethernet board doesn't know how to get through to the primary gateway and probably needs a gateway address to the Internet. Anyway to do that?
Also, have you tried implementing a scheduling program into the webserver for the x10 modules? I'd like the lights to come on via a clock calendar program. Also, I'm thinking about using NTP NIST time server to provide the clock. Any thoughts?
Nick