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

UEVENT[1179437041.635359] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2 (usb)
UEVENT[1179437041.635412] add      /class/usb_endpoint/usbdev7.3_ep00 (usb_endpoint)
UEVENT[1179437041.635424] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2/7-2:1.0 (usb)
UEVENT[1179437041.635434] add      /class/scsi_host/host7 (scsi_host)
UEVENT[1179437041.635443] add      /class/usb_endpoint/usbdev7.3_ep81 (usb_endpoint)
UEVENT[1179437041.635450] add      /class/usb_endpoint/usbdev7.3_ep02 (usb_endpoint)
UEVENT[1179437041.635458] add      /class/usb_device/usbdev7.3 (usb_device)
UDEV  [1179437041.642439] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2 (usb)
UDEV  [1179437041.710637] add      /class/usb_endpoint/usbdev7.3_ep00 (usb_endpoint)
UDEV  [1179437041.715814] add      /class/usb_endpoint/usbdev7.3_ep81 (usb_endpoint)
UDEV  [1179437041.755728] add      /class/usb_endpoint/usbdev7.3_ep02 (usb_endpoint)
UDEV  [1179437041.832881] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2/7-2:1.0 (usb)
UDEV  [1179437041.859131] add      /class/scsi_host/host7 (scsi_host)
UDEV  [1179437041.915172] add      /class/usb_device/usbdev7.3 (usb_device)
UEVENT[1179437047.231025] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2/7-2:1.0/host7/target7:0:0/7:0:0:0 (scsi)
UEVENT[1179437047.231073] add      /class/scsi_disk/7:0:0:0 (scsi_disk)
UDEV  [1179437050.814702] add      /devices/pci0000:00/0000:00:1d.7/usb7/7-2/7-2:1.0/host7/target7:0:0/7:0:0:0 (scsi)
UDEV  [1179437050.837753] add      /class/scsi_disk/7:0:0:0 (scsi_disk)
UEVENT[1179437135.503322] remove   /class/usb_endpoint/usbdev7.3_ep81 (usb_endpoint)
UEVENT[1179437135.503358] remove   /class/usb_endpoint/usbdev7.3_ep02 (usb_endpoint)
UEVENT[1179437135.503369] add      /block/sdb (block)
UEVENT[1179437135.503377] add      /class/scsi_device/7:0:0:0 (scsi_device)
UEVENT[1179437135.503386] add      /class/scsi_generic/sg2 (scsi_generic)

Message from syslogd@prova at Thu May 17 23:25:35 2007 ...
prova kernel: [  237.515135] Oops: 0000 [1] SMP 

Message from syslogd@prova at Thu May 17 23:25:35 2007 ...
prova kernel: [  237.515764] CR2: 0000000000000000
UDEV  [1179437135.514333] remove   /class/usb_endpoint/usbdev7.3_ep81 (usb_endpoint)
UDEV  [1179437135.516361] remove   /class/usb_endpoint/usbdev7.3_ep02 (usb_endpoint)
UDEV  [1179437135.539401] add      /class/scsi_device/7:0:0:0 (scsi_device)
UDEV  [1179437135.565874] add      /class/scsi_generic/sg2 (scsi_generic)
UDEV  [1179437135.624379] add      /block/sdb (block)