What sort of things would you like to see with c/c++/asm ? I'm pretty sure we can build a whole 'nother book out of that. The only things that I've been using c/c++ for lately are for network tools that require serious speed (ettercap/skipfish).
Skipfish is a brute if I ever saw one. As for the book, haven't read it yet so I can't comment but judging from the review, I may pick it up some time. Now as for what I would want to see in these types of books, differs from what many would want to see.
Assembly as a whole is a huge monster to cover let alone getting into the dissection, disassembly and debugging of it. I would want a book that goes more in depth on the frameworking of exploitation. Not: "look at the cool NOP sledding!" Something that blankets protections (ASLR/DEP/SEH/etc) which again, would likely be three books.
Have you guys thought about doing something like an interactive eBook online? Think about that. Chapter based book, where via subscription, one learns and performs samples via the web. Perhaps with audio/video walkthroughs. Would be akin to a challenge in the sense that in order for someone to get to the next chapter, they'd have to finish and fully understand the chapter they're on. You could price it the cost of a book for 6mos of access while the reader not only goes through walkthroughs, but can watch a video/hear an audio description of what you're talking about. Something like this has not been done from all I have seen. Would be cool for ADHD/ADD driven security slackers such as myself.