Hi.
I had a look around, there are no really great RHCE books I've found. Be careful when you buy them, I bought one without reading deep into it and it was for RH6.something. Which kinda sucked since alot of things had changed.
Overall the best book I've found is the Unleashed ones. Like RH9 Unleashed etc. They basically step you through how to setup a mail server, setup a samba server etc etc. They aren't actual study guides, but the info is there.
The only Red Hat endorsed books are the ones they give you when you enroll in their courses. These books are the best out there, unfortunately they cost an arm and a leg as the courses do. Well worth it though.
Check out the unleashed series though.
Good luck
>Craig