I'm beginning to think this is a bluetooth issue. I'm experiencing these regular kernel panics on a Z77N-UD5H too, only after the system wakes from sleep. Until then, like everyone else in the thread, no KPs at all. Then after the system sleeps/wakes, something innocuous like launching Parallels will cause a KP.
Here's what I get in Console every time:
11/4/14 1:57:01.000 PM kernel[0]: REQUIRE_NO_ERR failure: 0x1 - file: /SourceCache/IOBluetoothFamily_kexts/IOBluetoothFamily-4300.4.10/Core/Family/HCI/Transports/USB/IOBluetoothHostControllerUSBTransport/IOBluetoothHostControllerUSBTransport.cpp:2109
I'm using a GMYLE Bluetooth 4.0 USB dongle, FWIW. It worked perfectly with Mavericks, and works perfectly with Yosemite until the system wakes from sleep, apparently.
Hopefully this helps the bloodhounds get to the bottom of this. It's getting to be a real PITA. This Z77N-UD5H/i7-3770K rig has served me flawlessly for several years now, and never gave me any trouble at all until this Yosemite KP issue.