dan@lime:~$ ls -lR /proc/bus/usb
/proc/bus/usb:
total 0
drwxr-xr-x 2 root root 120 2006-10-22 17:13 001
drwxr-xr-x 2 root root  80 2006-10-24 07:45 002
lrwxrwxrwx 1 root root  14 2006-10-22 17:13 devices -> .usbfs/devices

/proc/bus/usb/001:
total 0
crw-rw-r-- 1 root root 189, 0 2006-10-22 18:13 001
crw-rw-r-- 1 root root 189, 1 2006-10-22 17:13 002
crw-rw-r-- 1 root root 189, 2 2006-10-22 17:13 003
crw-rw-r-- 1 root root 189, 3 2006-10-22 17:13 004

/proc/bus/usb/002:
total 0
crw-rw-r-- 1 root root 189, 128 2006-10-22 18:13 001
crw-rw-r-- 1 root root 189, 142 2006-10-24 07:45 015