This latest screenshot from the Wi-Spy is probably useless for everyone else.
What you're seeing is the traffic generated by my running "iwlist eth1 scanning" on the AP, over and over and over. Doing so revealed that the light noise between channels 10 and 13 isn't actually my neighbor's network. Rather, it's two neighbors' networks on channel 11. There was also another neighbor's network on channel 9 (weird choice).
I really need to get outside and map the neighborhood. I especially need figure out how much interference the video sender will cause if I leave it running on channe 4 (around channel 11 for 802.11 traffic).
Note to self: copy these pics into the wiki.