Here is a patch that makes it possible to call udev with options on the command line.
Valid options are for now:

-V for the udev version:
    kay@pim:~/src/udev.kay$ ./udev -V
    udev, version 011_bk

-r for the udev root:
    kay@pim:~/src/udev.kay$ ./udev -r
    /udev/

-q to query the database with the sysfs path for the name of the node:
    kay@pim:~/src/udev.kay$ ./udev -q /class/video4linux/video0
    test/video/webcam0


What do you think?

thanks,
Kay