This thread was inspired by this posting in the ‘Which Two Towers?’ thread:
I have a few suggestions of my own:
Frodo Baggins’ Day Out
The Elvish Princess Bride
The Usual Maiar Suspects
Bring Me The Head Of The Ringbearer
Citizen Saruman
Burning Trees With Wolves
OK, it’s your turn!
Monty Python and the Two Towers.
Planet of the Rings
Beneath the Planet of the Rings
Escape from the Planet of the Rings
Conquest of the Planet of the Rings
Battle for the Planet of the Rings
Planet of the Rings (Tim Burton remake version)
I know, I cheated, they weren’t books. Try again:
Middle Earth
Middle Earth Messiah
Children of Middle Earth
God Emperor of Middle Earth
Heretics of Middle Earth
Chapter House Middle Earth
and by Christopher Tolkein:
Prelude to Middle Earth
“Stop the Planet of the Rings, I Want To Get Off” (The stage-musical featuring Troy McClure)
Don’t worry, anything goes!
(The original suggestions were all films…)
Le Comte de Monte Doom
Les Trois Hobbits
Le Chevalier de Orthanc
Le Chevalier de Minas Tirith
Le Vicomte de Rivendell
(All by Alexandre Tolkeinas)
Gone With The Ring
To Kill a Hobbit
A Tale Of Two Towers
One Flew Over Mount Doom - (I don’t know how to really spell th ename of that perticular mountain.)
B*****d. I wish I’d thought of that one. Well done!
The Fellowship Of The Ring:
The Nine
The Notorious Nine.
The Two Towers:
Losta Towers
Sorry that should be: “Lotsa Towers”
Wow - I inspired a thread! 
Okay, while I still have to stick by my “D,WMT?” title, here is another set of possibilities, based on the Tolkien’s original division of the work into 6 “books” (rather than the usual titles for the “trilogy”).
Book I: Frodo and Sam’s Excellent Adventure
Book II: O Gandalf, Where Art Thou?
Book III: War and Trees
Book IV: Frodo and Sam’s Bogus Journey
Book V: Orcs and Uruks and Nazgul, O My!
Book VI: Frodo Versus the Volcano
What do you think, sirs?
I think that “Frodo and Sam’s Bogus Journey” deserves: 
!
I. Frodo and Sam’s Excellent Adventure. (ala monstre - but we were both thinking the same thing).
II.Wraith’s World
III Dude! Where’s My Ring?
If it were a porno:
Lord of the Cockrings.
The Shadow of the Abhorred[sup]*[/sup]
The Ring of the Conciliator
The Sword of the King
The Citadel of the Steward
[sup]*[/sup]Sauron was “The Abhorred”
Book 1: Rings In The Attic
Book 2: The Hunt For Frodo In October
Book 3: The Seven Habits of Highly Effective Wizards
Book 4: Bang the Gollum Slowly
Book 5: Something Wicked On a Flying Monster Thing Comes
Book 6: Catch-Aringinmountdoom
The Sue Grafton approach, but I’d need to further subdivide the books:
Prolog:
A is for Alchemy (and the forging of the rings)
Book 1:
B is for Baggins
C is for Caradhras
Book 2:
D is for Dunedain
E is for Ents
Book 3:
F is for Frodo
G is for Gollum
Appendix:
H is for Havens
Or there’s the Erle Stanley Gardner approach:
Book I:
The Case of the Ruling Ring
The Case of the Broken Fellowship
Book II:
The Case of the Sorry Saruman
The Case of the Grumbling Gollum
Book III:
The Case of the Nasty Nazgul
The Case of the Fiery Forge
The Many-Colored Middle Earth
The Golden Ring
The Born King
The Adversary