Reddit mentions of Encountering Jesus & Buddha: Their Lives and Teachings

Adding to that, the best Buddhist-Christian book I have ever read is Encountering Jesus & Buddha, co-written by a New Testament scholar and an Indian religions scholar.

Well first, read a Gospel straight through.

I thought this dialogue was pretty cool. I can at least vouch for Ulrich Luz, who has written extensively on Matthew's gospel: http://www.amazon.com/Encountering-Jesus-Buddha-Their-Teachings/dp/0800635647/ref=la_B001ITXLVW_1_4?s=books&ie=UTF8&qid=1408078436&sr=1-4

This is kind of tangential, but this book where Buddhists write on the Rule of Benedict is really cool: http://www.amazon.com/Benedicts-Dharma-Buddhists-Reflect-Benedict/dp/1573221902/ref=sr_1_1?s=books&ie=UTF8&qid=1408078637&sr=1-1&keywords=benedict%27s+dharma

In a certain sense, Benedict's Rule and the entire monastic enterprise is
an attempt to deeply understand and live out Christ's teachings. In a similar spirit I would recommend The Cloud of Unknowing, which is a shining example of Christian mysticism and apophatic theology. Apophatic theology tends to create a platform for Christian-Buddhist dialogue for some reason.

Speaking of monks, Merton's Zen and the Birds of Appetite probably represents his most mature and developed thinking on Buddhism (or at least one dimension of it.) It pairs very nicely with his book on the Desert Fathers, The Wisdom of the Desert. (I don't recommend Mystics and Zen Masters, which is more of a historical overview of various figures.)

Here's a memoir of Paul Williams' conversion from Buddhism to Catholicism. Williams is a leading scholar of Mahayana Buddhist philosophy. http://www.amazon.com/Unexpected-Way-Converting-Buddhism-Catholicism/dp/0567088308/ref=sr_1_2?s=books&ie=UTF8&qid=1408078793&sr=1-2&keywords=paul+williams+buddhism

Thich Nhat Hanh's Living Buddha, Living Christ is a very popular example of a Buddhist reflecting on Christianity as he sees it.

But seriously, read a gospel. Any of them, or all of them. That's the most important part. All the rest is commentary.