Although I added serial console, it should work without by following the emergency recovery procedure (you cannot flash from the D-Link firmware):
Connect via a LAN cable to your PC
Set your PC to 192.168.0.x
Press the Reset Button, keep it pressed and plug in power
Keep the reset button pressed for 5-10 seconds
Connect with a browser to 192.168.0.20
You should be prompted with an upload form, upload firmware there
After installation, I had to manually run the firstboot script, becuase the JFFS2 partition was not correctly generated by the image. Your new OpenWrt is at 192.168.1.1 via LAN.
I installed "motion", so far motion detection works but I have yet to figure out a good configruation. LAN and WiFi work, as does the camera. The camera module itself is really connected via USB. I haven't tested Audio.
I tried these instructions on the DCS-932L, which is bacially the same board, but with added IR diodes and an IR filter. I can read the light sensor and toggle the IR LEDs and IR filter, but I have yet to automate this. For now, it's just setting GPIOs.
I will probably add the relevant information to the Wiki later this week.
Too many devices running on OpenWRT right now...