I just released a new application that can be very helpful in such cases. It's called "Help Me 2 Help You" and this exactly what it does.
It requires the user to install the app and at a "press of a button"
all the data that you might need is attached to a single email the user can now send to you (including logcat, device info, ROM info etc).
You can read more about this app here:
and download it here:
Hope this helps