This review compares the two:

http://www.amazon.com/review/R1886YLT8PR55U

The dearth of exercises disappoints me, so I'll probably read APUE also.

Saw that (but thanks), wondering if anybody here has both and could expand on it. I have and love APUE, especially since it isn't Linux-specific. To what extent would TLPI be relevant for (say) BSD?