You are herevirtualbox
virtualbox
Make Shared Folders Work in TinyXP as a Guest in VirtualBox
I gave TinyXP Rev 09 a try recently as a guest in VirtualBox. (I do have a legal license for Windows XP, so while that definitely doesn't make downloading TinyXP legal, I feel that morally speaking it's ok).
I wasn't able to browse for shared folders at \\vboxsvr as I expected. It is, however, possible to map these folders to drives using the "net use" command:
net use z: \\vboxsvr\david
That worked perfectly. Have fun!
VirtualBox USB with Windows XP guest in Ubuntu Hardy or Intrepid

First of all, USB will not work in VirtualBox if you are using the Open Source Edition (OSE) of VirtualBox. Get the full closed-source edition of VirtualBox from their website. There are many differences between the open-source edition and the closed-source version and one of them is USB.
I finally got USB working with Windows XP running as a guest inside VirtualBox running on a Ubuntu Hardy host. First find out what the group id of the vboxusers group is: