I bought a copy back then out of curiosity (as a Linux user). It's an excellent book, and I don't think many of the techniques described in it are out of date. Things like the ELF format still form the infrastructure for Linux binaries. There's a bit of historical info too, but IMO reading that is analogous to reading about a language like C — it's of central importance if you want to understand how and why these systems developed.

So, I would recommend it.