> Any of you folks have a recommendation on a replacement?  

I've always had great success with the "UNIX System Administration Handbook" 
by Evi Nemeth,  Trent R. Hein, and  Garth Snynder. [http://www.admin.com/ ] 
Its in its 3rd addition, covers unix, as well as red hat linux specifically. 
My admin friends refer to it as *the* book, or the Purple book, used to be 
known as the red book (second addition) 

Its a bit spendy, but loaded with great info. 

Here is a link to the Table of Contents: 

http://www.admin.com/Pages/TOC.html 

Duncan