I find the annotated disassembly listings really useful, far more so than the books on assembly in making a game. While the books are necessary for looking up things like processor specs, timings - of a technical nature. And of course the basics. Its the games themselves where the practical applications are found. Being able to see how various creators did what they did is great.
The games I wish that would get this treatment are in no particular order...
The Forest - , its a mix of basic and assembly. How they managed to get the game space in the spectrum always made me scratch my head, especially considering it was a mix of basic and assembly (well according to infoseek).
Mailstrom - while the game was a grind, I always wondered how they got the scrolling to work like they did and all the various menus.
saboteur - I loved that game back in the day, to be able to poke around inside and figure out how it worked its 'magic' would be really something.