Thanks for sharing RazorBlade! It's quite interesting to see that the Ethernet shield does not have a fixed MAC address which is really weird and makes it susceptible to MAC collissions (though I doubt anybody is doing MAC-based routing much anymore). What will probably happen is that we end up with everyone using all 00-00-00-00-00-00 as their MAC. I wonder if it might be an issue if you have multiple devices with the same MAC address on the same subnet though.
Also, does the Ethernet shield have existing libraries for DNS lookup and all that?
Finally, what's the bottleneck in this system? Ethernet is really fast so why would sending a 50KB picture take 30 seconds?
Sorry for hi-jacking this thread with n00b questions.