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i had a client that had the same problem. Backup System.kext from System/Library/Extensions folder and the IOUSBFamily.kext from the System/Library/Extensions folder and also back up mach_kernel from the root directory. This is the folder that houses your Applications folder, System Folder, Library Folder, ETC. The kernel is hidden use an app to show hidden files. Update to 10.6.4 after update is installed do not reboot. Delete the mach_kernel from the the root directory and restore the backed up mach_kernel to the root directory by dragging it in. You need to trash the mach_kernel befor you can drag and drop the backuped one. Then install the backed up system.kext and the IOUSBFamily.kext then reboot and you should have a fully updated system with fully working usb support. It seems that the 10.6.3 update broke support for some usb devices. The key is to use the kernel from 10.6.2 and the system.kext and the IOUSBFamily.kext from 10.6.2 before the usb devices where broken in 10.6.3. I hope this helps.
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