>Well, there are USB bus analyzer boxes, but they cost thousands of
>dollars. I keep hearing rumors of replacement Windows USB drivers that
>do this, but haven't actually found such.

I saw references to such drivers on the web page of the people who did the
USB Visor support ....

Ah-ha, here it is!

http://www.catc.com/products/support/sup_vwr.html

--Ken