Anybody who's done a bit of device driver development will know that occasionally system logs just don't provide enough information about the various problems you'll encounter and you have to hack up a shim library which sits between a problem library and it's loader/calling module. Linux Journal has a very nice article this month on creating just such a library for libusb. This could be useful for anybody developing an application or driver which needs to communicate with a USB device. Like writing a synch for a PDA, MP3 player or somesuch..