Hey, there is a Facebook group devoted to this very purpose, entitled "Besides, it's a B-side"! It actually has about 800 members. Everyone's welcome.
Here are mine, in order:
Q - Love Pollution (flip side of "Dancin' Man")
Alan O'Day - Just You (flip side of "Undercover Angel")
Eric Carmen - Someday (flip side of "She Did It")
Eric Carmen - Hey Deanie (flip side of "Make Me Lose Control")
Donna Summer - Journey to the Centre of Your Heart (flip side of "Hot Stuff")
England Dan & John Ford Coley - Calling For You Again (flip side of "We'll Never Have to Say Goodbye Again")
Leo Sayer - Magdalena (flip side of "You Make Me Feel Like Dancing")
Diana Ross - Too Shy to Say (flip side of "You Got It")
Doobie Bros. - Rockin' Down the Highway (flip side of "Jesus Is Just Alright")
Fleetwood Mac - Never Going Back Again (flip side of "Don't Stop")
Fleetwood Mac - Gold Dust Woman (flip side of "You Make Loving Fun")
Jennifer Lopez - Let's Get Loud (flip side of "Love Don't Cost a Thing")
Billy Joel - Through the Long Night (flip side of "It's Still Rock & Roll to Me")
Lettermen - Turn Around, Look at Me (flip side of "How is Julie?")
Roy Orbison - Love Hurts (original of Nazareth song; flip side of "Running Scared")
Cowsills - Love American Style (flip side of "Silver Threads & Golden Needles")
And the artist with the most consistently best B sides is: Dolly Parton!