Stuff that's helped many of us:
LOVE LANGUAGES by Gary Champman. It's a great way to learn about yourself and others. Check out the quick online quiz, or order the book.
Fit to Be Tied by Bill Hybels & Lynne Hybels
Love for a Lifetime: Building a Marriage that Will Go the Distance by James Dobson
Sex God: Exploring the Endless Connections Between Sexuality And God by Rob Bell
Check lots of resources from Family Life, including conferences (Weekend To Remember), books and podcasts.
Boundless.org has many resources for dating and relationships
Think Marriage also has tons of great resources for any relationship. "Better relationships start here."
What Do healthy relationships look like? Some questions to ask to find out...
Just for Guys
Every Mans Battle Books, seminars, & lots more for guys
Wild at Heart learn lots about how men tick, and what they're made for... byt John Eldredge
Gods Gift To Women: Discovering
The Lost Greatness Of Masculinity by Eric Ludy
Just For Ladies
Every Womans Battle Books, Authors & lots more for ladies
Captivating: Unveiling the Mystery of a Woman's Soul by Stasi Eldredge
Authentic Beauty: The Shaping of a Set Apart Young Woman by Leslie Ludy
Carolyn McCulley's blog on women, health, family and lots more