I bought a Beagleboard xM more than 2 years ago, as I wanted to make it work as a USB sniffer, based on the work of Nicolas Boichat. But at this time I didn’t manage to make it work, as my knowledge on embedded systems was quite limited.
I have lately been working back on this, and last week during a hacking session in my local hackerspace, namely Hacknowledge (Rennes, France), I finally managed to make it work It produces capture files that can be opened with Wireshark!
The following picture shows my beagleboard xM sniffing USB traffic between my Xbox 360 and a controller:
Instructions are available in my git repository.