I've recently published a white paper which helps outline USB redirection in Horizon with View.
It can be downloaded for free here: http://www.vmware.com/files/pdf/techpaper/vmware-horizon-view-usb-device-redirection.pdf
Also, I recently published a short video about USB redirection to accompany the white paper; available here: Using Composite USB Devices in Horizon View Desktops - YouTube
cheers
peterB
