udevmonitor will print the received events for:
UDEV the event which udev sends out after rule processing
UEVENT the kernel uevent

UEVENT[1178124056.342310] add      /devices/pci0000:00/0000:00:14.4/0000:06:04.0/0.0 (pcmcia)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:14.4/0000:06:04.0/0.0
SUBSYSTEM=pcmcia
SEQNUM=2595
PHYSDEVBUS=pcmcia
SOCKET_NO=0
DEVICE_NO=00
MODALIAS=pcmcia:m0045c0401f04fn00pfn00pa7A954BD9pb91844B1CpcAAC4295Bpd00000000

UEVENT[1178124056.988826] add      /module/pata_pcmcia/drivers (module)
ACTION=add
DEVPATH=/module/pata_pcmcia/drivers
SUBSYSTEM=module
SEQNUM=2596

UDEV  [1178124056.991757] add      /module/pata_pcmcia/drivers (module)
UDEV_LOG=3
ACTION=add
DEVPATH=/module/pata_pcmcia/drivers
SUBSYSTEM=module
SEQNUM=2596
UDEVD_EVENT=1

UEVENT[1178124056.992738] add      /module/pata_pcmcia (module)
ACTION=add
DEVPATH=/module/pata_pcmcia
SUBSYSTEM=module
SEQNUM=2597

UDEV  [1178124056.995432] add      /module/pata_pcmcia (module)
UDEV_LOG=3
ACTION=add
DEVPATH=/module/pata_pcmcia
SUBSYST