If the Buddha Dated is the best guide to healthy relationships I've ever found. I recommend it all the time to anyone with relationship problems, or a tendency to have less than desirable results with others (friends included). No quick fix, but realistic spiritual-based advice that will help.
I also highly recommend "If the Buddha Were In Love" by Kasl, which is an audiocassette series that will absolutely change the way you view love and relationships. But in a wonderful way.
The books and tape series do not try to convert people into Buddhism (she incorporates all spiritualities, by the way), but I have found some people are put off by the mention of Buddhism. I wish they wouldn't and that they'd give it a chance.
I have read more than my share of self help books but this is the most helpful book I have ever read. It started out slow - in the first pages I was rolling my eyes because I felt like it was simple stuff I already knew, but by page ten I was engrossed and thrilled. It is simple, straightforward, fun reading, it makes complete sense and helps clarify the issues that come up in every kind of relationship, from partners to potential partners, to family and friends. I could not put it down. I had an 'aha' every few pages, found it joyful and affirming and incredibly helpful. When I was halfway through it I bought 8 more copies and gave them to eight friends. They all loved it and have all given copies to their friends and family. I quickly saw my relationships to others and to myself start to change, I actively used the theories to improve my dynamics with others and one day read just one sentence and completely let go of some pain I'd been carrying for days over a conflict with a friend. Poof - it was gone and I was looking at it from a whole new place and learned a lesson I have used again and again since that day. I also re-established contact with a friend who I'd parted ways with years ago and in one easy conversation we came together again resolved the problem, laughed over how big we'd made it and have had a healthier, happier and closer friendship than ever since. I am back today to order 3 more copies for three more people - one of them is the new man in my life whom I feel this book was intrumental in helping me find. I'm choosing differently, approaching things differently and what's more - I'm happier and feel more clear and peaceful about relationships than I ever have. Get this book and a few extras for the people you love - you won't regret it. And grab your highlighter- there are gems on every page.