USBlyzer is an easy to use Professional Software USB Protocol Analyzer for Windows, which provides a complete yet simple to understand view for monitoring and analyzing USB Host Controllers, USB Hubs and USB Devices activity.

With USBlyzer you can:

View all plugged USB devices in hierarchical auto-refreshed tree view along with detailed information about each USB device properties and their child components:
USB device stack layout: Device objects for each driver that is involved in handling I/O activity.
USB descriptors: Device Descriptor, Configuration Descriptor, Interface Descriptor, Endpoint Descriptor, etc.
Information related to Plug and Play: Hardware IDs, Instance ID, Software Key, etc.
Capture, decode and display important information going through USB device stack:
USB-related requests such as URBs and structures used by USB device drivers.
I/O Request Packets (IRPs) used by PnP subsystem.
Kernel-mode and user-mode device I/O control requests (IOCTLs) used by USB client drivers and user-mode applications.
Incoming and outgoing data traffic of the USB devices.
Trace USB requests that the user-mode applications and USB device drivers use to communicate with the USB driver stack.
Analyze USB protocol and USB devices I/O activity with ease.
Filter to exclude non-essential information from the view.
Search the captured data for the particular request types.
Save captured data in binary file for later analysis.
Export USB descriptor hierarchy and all captured data to a file.

Home Page: http://www.usblyzer.com/