>> If you do not need to analyse the physical layer, then maybe you can go 
>> with
>> a software only based USB sniffer, like:
>
> Some more links here.
> http://www.microchip.com/forums/tm.aspx?m=493704
>
> I am going to try the one built-in Windows 7 soon.

Oh, is there? Where does that hide? 

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