IC Reverse Engineering
...well, not really, just out of plain curiosity! ;)
A while ago an enthusiastic reader reported on a bold method of taking a peek inside programmed ICs to actually read ROM contents by means of pattern recognition software, provided the architecture and the programming language were known (here ). Later, we discovered that this technique had a long story behind it we weren't aware of!
I found some more information in one of my favorite sites .
Another interesting approach here .
UPDATE (March 4th, 2013):
8085's register file , by Ken Shirriff.