While looking into the course of kernel panics on my iMac, I found that two kexts relating to Avatron’s Air Display were in /System/Library/Extensions, despite the fact that I uninstalled Air Display using their bundled uninstaller a bit back. The two offending files are AVVideoCard.kext and AVFrameBuffer.kext. Simply moving them outside of the Extensions folder and rebooting is enough to get rid of them, and there doesn’t seem to be any ill effects.
We’ll see if that fixes the kernel panics.