ok so my work schedule has kind of changed, and when I get home I've just been craving softer music, don't worry I'm banging out to SBS, Please, and Crazy Tonight all day long, but the sudden urge for a soft U2, here's my list so far:

If God Will
Moment Of Surrender
Promenade
The First Time
Heartland
40
MLK
One Step Closer
Grace

This is a play list I made several years ago which I call Mellow.  It's very soothing.  I've used it multiple times as dinner music when having guests over.  It's probably the only play list I've made that I've consistently used.  It flows really well.  If i were to re-do it, I would try to incorporate songs from the last two albums.  But then I'd have to figure out the song order all over again.

Stateless
So Cruel
If God Will Send His Angels (Single Version)
Stay (Craig Armstrong version)
All I Want Is You (Edit)
Slow Dancing (Willie Nelson version)
One (Live from Modena)
Heartland
Two Shots of Happy, One Shot of Sad
If You Wear that Velvet Dress
Miss Sarajevo
Falling at Your Feet
The Hands that Built America
Love is Blindness
Grace

The First Time
Van Diemens Land
White As Snow
Running To Stand Still
Slug
If You Wear That Velvet Dress
Mothers Of The Disappeared
Never Let Me Go
One Step Closer
The Wanderer

North And South Of The River
Your Blue Room
If You Wear That Velvet Dress
One Step Closer
Slug
Cedars Of Lebanon
Promenade

Passengers: Original Soundtracks 1

Fez-Being Born
Luminous Times
Bad
All I Want is You
MLK
The Unforgettable Fire
Heartland
Van Diemens Land
Your Blue Room
White as Snow
If God Will Send His Angels
Moment of Surrender

I just so happen to have a U2 playlist in my itunes called soft.
40
Acrobat
All I Want is You
An Cat Dubh
Drowning Man
Exit
Grace
I Threw a Brick Through a Window
If God will Send his Angels
Into the Heart
Love is Blindness
MLK
Moment of Surrender
October
One
One Step Closer
Please
Promenade
Running to Stand Still
Shadows and Tall Trees
Sometimes You Can't Make It On Your Own
Stay
Surrender
The Ocean
The Unforgettable Fire
Tomorrow
Tryin' to Throw Your Arms Around the World
Unchained Melody
Van Diemen's Land
Who's Gonna Ride Your Wild Horses
White As Snow
With or Without You
Yahweh

I burned a copy for my chiropractor and he hasn't gotten any complaints.

All I Want Is You
Miss Sarajevo   
Mothers Of The Disappeared   
In a Little While      
Acrobat      
Drowning Man   
Running To Stand Still   
Love Is Blindness   
Love Comes Tumbling      
Wake Up Dead Man   
One      
Into The Heart   
Promenade         
Stay (Faraway, So Close!)   
White As Snow   
With Or Without You   
The Hands That Built America (Theme From Gangs Of NY)      
Your Blue Room      
Tomorrow   
"40"   
October   
MLK      
The Ocean         
If You Wear That Velvet Dress   
Fez: Being Born   
Heartland   
Shadows And Tall Trees   
Ultraviolet (Light My Way)   
The First Time   
Do You Feel Loved   
Disappearing Act

Dreamy 'Promenade' springs to mind.