How about something of German manufacture ?
Haven't played with their USB models, but have played with their other kit and was very easy to set up.
SEH Print Servers
These are USB Device servers and so can be used with more than just printers, apparently.
UPDATE: for some reason, the link above does not take you to the right page, please use the products menu and click on the "USB Device server" option (don't select any of the items on the little sub-menu and you will get an overview page of their USB products).