My two complimentary copies of Running Linux, 4th ed., showed up today. Since I wrote a few pages of it (and did a technical review on the rest), I can't give an unbiased review.

I did note a few whoppers (a couple of my notes didn't make it in: most notably, bzImage isn't compressed using bzip2), and I think enscript gets discussed twice for some odd reason, but overall I think it brings Running Linux into the 21st century while retaining the spirit of Matt's original; there's something in here for all but the most seasoned Linux veteran, and it's still the first book you should buy before installing Linux, no matter what the flavor. (I remember being excited when Linux Installation and Getting Started, the predecessor of RL, came out, which will give you some idea of how long I've been a Linux afficianado.)

Incidentally, the material I wrote is in one of the two free chapters (Chapter 7; PDF pages 25–32 — real pages 196–203) available at O'Reilly's website.