Typically I don't think the USB port works beyond FAT32 storage (USB drives) and some printers.
Here's the printer FAQ from the Oz site.
http://www.draytek.com.au/faq/USB_printer.htm
I've got a multifunction printer/scanner so I've had to set up another IP device with USB ports as a USB over IP solution. I used this:
http://www.incentivespro.com/downloads.html
My IP device was an old NSLU2 which had been hacked to run OpenWRT. I serve the printer to my Linux Samba DC as the Linux versions are free (I had to do this as my DC is a Citrix VM so no USB pass through). The Samba DC acts as a print server for windows clients which was simple enough - but I knocked up a separate script to get the scanning working from there. Basically the DC scans a directory looking for a file with a job name in it. On the windows clients, I have a basic batch file that takes input for a file name and then drops the file in the directory the DC is scanning. Once the DC picks up the file - it runs the scanner and generates an image using the name the windows box provided.
It's a shame that this kind functionality isn't in the router really as it would be a plus for the product line. However .. the printing features of the Draytek range are basic. Running CUPS on Linux is a much better solution.
