Great thread. Got me thinking about which album sides I play the most. BTW, for review of pop/rock music, Robert Christgau is indespensible and a good place to look for new music...http://www.robertchristgau.com/
Here are few less obvious pop album sides:
Buena Vista Social Club, side C
El Carretero
Candela
Amor de Loca Juventud
Johnny Cash "American IV" side 1
The Man Comes Around
Hurt
Give my Love to Rose
Bridge Over Troubled Water
I Hung My Head
First Time Ever I Saw Your Face
Personal Jesus
The Clash "London Calling" side 1 (gets extra credit for the coolest album cover ever)
London Calling
Brand New Cadillac
Jimmy Jazz
Hateful
Rudie Can't Fail
Elvis Costello "Imperial Bedroom" side 1
Beyond Belief
Tears Before Bedtime
Shabby Doll
The Long Honeymoon
Man Out of Time
Almost Blue
...and In Every Home
Miles Davis "Kind of Blue" side 1
So What
Freddie Freeloader
Blue in Green
Fine Young Cannibals "Eponymous" side 1
Johnny Come Home
Couldn't Care More
Don't Ask Me to Choose
Funny How Love Is
Suspicious Minds (possibly greatest cover ever?)
Prince "Sign O The Times" side 3
U Got the Look
If I Was Your Girlfriend
Strange Relationship
I Could Never Take the Place of Your Man
Rockpile "Seconds of Pleasure" side 1
Teacher Teacher
If Sugar Was As Sweet As You
Heart
Now and Always
A Knife and Fork
Play That Fast Thing
Stevie Wonder "Hotter Than July" side 2
Master Blaster (Jammin')
Do Like You
Cash In Your Face
Lately
Happy Birthday
X "More Fun in the New World" side 2
Devil Doll
Painting The Town Blue
Hot House
Drunk in my Past
I See Red
True Love Pt. #2