Of course, 'brilliant' is what you'd expect from Feynman. These lectures, originally presented in 1983-6, capture a number of the most fundamental, esoteric concepts in computing. Since Feynman is doing the explaining, however, the ideas come across clear and strong.
Chapter 3, on the basic theory of computation, introduces not only the Turing machine, but also the basic idea of what things can and can not possibly be computed and why. He also explains the "universal" machine, and the meaning of universality that mathematically steps up from any one machine to all machines. The next chapters discuss coding theory. That has body of knowledge has since become pervasive in our every-day lives, even if it's never visible. After that two chapters present the physical limits to computation, and how computation can approach those limits using quantum mechanics.
This includes the superfically odd idea of reversible computation. I say odd because, for example, knowing that two numbers add up to six doesn't tell you whether the two were five and one, zero and six, or some other combination. You normally can't run addition backwards from the sum to the summands, so standard addition is said to be irreversible. Reversibility gives amazing properties to a system, however, and things like the Toffoli gates show how it can be implemented.
The only disappointments in this book come from the very beginning and very end. The beginning describes what a computer is, as if the reader had never heard of computers before. I guess that basic level is still needed, but is no longer needed at the college level. The very end describes silicon technology, as it was known in the early 1980s. Despite some fascinating bits of device physics and some heavy editing, that discussion has aged with the rapidity you'd expect from Moore's law. And in a few places, the older discussions of biological systems have aged poorly.
Still, his explorations of the physical limits to computation as just as fresh and salient as ever. I recommend this to anyone with a beginner's interest in the foundations of coding, computing, and quantum computation.