I treat this book as a perfect collection of brilliant ideas, many of which you will find implemented in most commercial compilers.

Whether it helps to write your own compiler? -- sure. Are you thinking about IR (internal representation) that will be easy to create and, most important, walk through and manipulate? -- take a look how Fraser et al did it; they did it well. Think how to write a front end or code generator? -- it's all there. Sure, blind copying won't work -- optimizing compiler will call for way more sophisticated BURG-like technique (one of the best known code generation techniques by now), but, all in all, it'll be BURG-like, and it's in the book as well.

So, if you want to show your students (or learn yourself) how compilers should be written, you cannot find anything better than LCC accompanied by this book. Fraser's team did it right.

In the two years since I last worked directly with lcc, I've consulted the book on numerous occasions; Messrs. Fraser and Hanson have a clear writing and programming style that makes this book (and the awesome paper that they wrote with Todd Proebsting on lburg) one of my standard "how-to" books on simple IR and code generation issues.

I'd only like to see more information about lburg; in particular, more about using lburg to do some simple optimizations. The writing style is clear and reasonably concise, but the constraints of retrofitting literate programming techniques onto an existing software project can make the code presentation a little fragmented. Still, I always found what I wanted and usually found the explanation to be quite good.