Something

monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[1321111209.756250] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2
SUBSYSTEM=usb
DEVNAME=bus/usb/001/009
DEVTYPE=usb_device
PRODUCT=4e8/3413/100
TYPE=0/0/0
BUSNUM=001
DEVNUM=009
SEQNUM=1480
MAJOR=189
MINOR=8

KERNEL[1321111209.756518] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=4e8/3413/100
TYPE=0/0/0
INTERFACE=7/1/2
MODALIAS=usb:v04E8p3413d0100dc00dsc00dp00ic07isc01ip02
SEQNUM=1481

UDEV  [1321111209.793949] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/001/009
DEVTYPE=usb_device
PRODUCT=4e8/3413/100
TYPE=0/0/0
BUSNUM=001
DEVNUM=009
SEQNUM=1480
libsane_matched=yes
ID_VENDOR=Samsung
ID_VENDOR_ENC=Samsung
ID_VENDOR_ID=04e8
ID_MODEL=Samsung_SCX-4100_Series
ID_MODEL_ENC=Samsung\x20SCX-4100\x20Series
ID_MODEL_ID=3413
ID_REVISION=0100
ID_SERIAL=Samsung_Samsung_SCX-4100_Series_0123456789ABCDEF
ID_SERIAL_SHORT=0123456789ABCDEF
ID_BUS=usb
ID_USB_INTERFACES=:070102:
MAJOR=189
MINOR=8
DEVLINKS=/dev/char/189:8
TAGS=:udev-acl:

UDEV  [1321111209.797576] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=4e8/3413/100
TYPE=0/0/0
INTERFACE=7/1/2
MODALIAS=usb:v04E8p3413d0100dc00dsc00dp00ic07isc01ip02
SEQNUM=1481