Visualizing the code of Atari 2600 games
Ben Fry has some cool graphics which visualize the code in several old Atari 2600 video games. Basically, he disassembles code and marks all possible branches with arcs between the lines of code, and changes all data tables to graphical representations of the bit patterns, revealing many sprites and other data tables. I dunno how useful it is, but it’s kind of neat.