I was still off work, so I wasted the day playing around on the computer. I now have a DHCP server running on the Raspberry Pi. I'm toying with turning off the one on the router, so I can point to my own choice of DNS servers - Comcast's seem to be... problematic quite often.
I've dumped sold some stuff on eBay, and I had just finished boxing it up when I heard the posty arrive, so I managed to get those shipped out. Yay.