Map or assign USB devices to virtual machines

Hi,

I searched this for a while and didn't find any proper solution. Here is my case :

I have three virtual machines, one under Linux, and two under WinXP. I also haveat least three USB devices connected to the host (running Windows 2008) : two printers and one Bluetooth dongle. I would like :

- that the two printers, when powered on, automatically plugs into the Linux VM

- the bluetooth dongle automatically goes to one of the WinXP VM

- anything else (like USB storage sticks) in the other WinXP.

I can't find any proper operation to do that, do you have some sort of idea ? Or do you know any other product that could do the trick ? (anything but hardware solutions, such as USB over Ethernet).

Thanks in advance