This is real interesting.

These look, well, lovely, but here's some more from my iTunes...Especially like the Gregory Isaacs.

Love is a Boombox- Ima Robot
Love Is Blue- Dorothy Ashby
Love Is Everywhere- Pharoah Sanders
Love Is Like A Toy- Daniel Johnston
Love Is Overdue- Gregory Isaacs
Love Is Teasin'-Marianne Faithfull/The Chieftains
Love Is The Drug- Roxy Music

My iTunes is currently empty due to a recent crash, but omissions that come to mind are:
Nine Inch Nails - "Love is Not Enough"
Rolling Stones - "Love is Strong"
Neil Young - "Love is a Rose"
Frank Sinatra - "(Love is) The Tender Trap"

You excluded the greatest "love is" song of all time: "Love is Alright Tonight" by Rick Springfield! There's also the fantastic "Love is Eternity" by They Might Be Giants and some other ones that I personally don't really like, but can think of: "Love is in the Air" by John Paul Young, "Love is All That Matters" by Human League, and "Love is Like a Bullet" by Shoes. Fun mix, by the way, but c'mon, none of your 2 songs are THAT long - so why only 12?

Only 12 because I found only 12 on my itunes. Don't worry-- I'll make another, better version once I've gotten everyone's suggestions. I do love Rick Springfield.

also:

"Love is Here" by Starsailor
"Love is Blindness" by U2

awesome idea for a mix =)