Thanks, everyone. I've now read an even ten Thich Nhat Hanh texts, ranging from the more popular mode (Miracle of Mindfulness, Being Peace) to the more straightforwardly Buddhist (Zen Keys, Transformation at the Base).
And the Lotus Sutra commentary as well, which I liked very much (respectfully disagreeing with rory on it): I particularly appreciated his reworking of the traditional division of the sutra in two parts, with fourteen chapters committed to one of the two truths. TNH introduces a third division: the familiar ultimate (absolute) and historical (provisional), as well as a field of action (taking in most of the chapters on the bodhisattvas). This fleshed out some aspects of the text that had been obscure to me.
I came to appreciate Thich Nhat Hanh more and more as I read more and more. Transformation at the Base was easily my favorite of the bunch. It's not as useful to my research, but it's an effective introduction to consciousness-only thinking. Astus suggested Nothing to Do, Nowhere to Go, and I'm glad he did; that is a text I will come back to later. I liked Interbeing and Zen Keys quite a lot too.
I'll have a look at the Diamond Sutra commentary at some point in the future. It won't be in the coming weeks, though, as the semester's winding up and I have to move ahead with other parts of the research.
Thanks to the help of generous sponsors (most of them from DharmaWheel), I'm doing a Vajra Armor (Dorje Kotrab) self-retreat this summer. May the merit be yours!