Houston's book is more in a theological perspective with a touch on historical heritage; Keller's book is more about His presence, correction, and intimacy. Both are great books! Now as I am typing, suddenly "Hearing God" by Dallas Willard came to my mind. I think I need to reread Willard's books again in the near future.
"The Clallery" (clallery.com) is a cyberspace gallery for people to clarify and to cherish our lives together. Lives could often become quite disoriented in the midst of our busyness, and we would love to display pieces of artwork and the short stories behind them which may allow us to reflect quietly, to converse with our Triune God, and to rejuvenate and reorient ourselves towards our creator in joy and at peace on entering healthy relationships with people and matters.