Vinculum is designed to be HOST often than DEVICE.
It implements even 2 basic commands to printer class device -
soft_reset and get_status(centronics style) - these commands are in specification in www.usb.org . So if You have command language description of printer You can send_data_to_device or
get_data_from_device (supported by Vinculum). Her problem is obtaining of right speciffications. Other and better option is to buy printer with standard PCL language (most of lasers).

These days i'm experimenting with Vinculum and today i tryed
our laser printer (provocated by this discussiopn).
"Hello" was printed successfully.
Setup was: Terminal program on WinXP, serial cable between PC and Vinculum monitor port, USB cable between Vinculum (VDIP1) USB port and laser printer Canon (with PCL). Vinculum reports device connected , when i attached printer. After this two commands and one string(HELLO) was sended to printer , using DSD(to device send data). Printer printed HELLO.

This printer has Ethernet port and before USB experiment i was
able to print same , using Hyperterminal in TCP/IP mode.

So, Alan Dorman can easy print needed documents.
regards

PS.It was important that printer has PCL. To run our inkjet Canon i need command description - which i can get from Canon in very hard way - first must register on Canon site, ask approval , wait 5 days for approval , receive ID/Password and go to download section for developers. So PCL makes this unnaccasary.