Some while ago someone asked if the read protection fuses of the AVRs can be bypassed. The answer is of course "yes - with proper tools". No big surprise. Today I finally found some details here:
It includes some very nice pictures of the details of an Atmega 88.
For a PIC someone already achieved this with "household" tools: http://www.bunniestudios.com/blog/?page_id=40
So obviously no need for a laser cutter if you know what you are doing ;)