I have just found the neat routine to read fuse, lock bits, etc. submitted by "westfw" in the forum in Oct. 2010. Works like a charm!
I notice he looks for a serial number in the upper 6 bytes of EEPROM that has the format "UNO" followed by a three byte number. This sounds like an excellent way to identify particular boards and keep track of their history.
Is this commonly done? Is this the standard way to identify boards (other than a grease pencil)?