Being present in the spiritual life always has a double meaning. There's present, as in here, in attendance. And there's present, as in now, a moment of time. What is the spiritual practice of being present? Being here now.
The world's religions all recommend living in the moment with full awareness. Zen Buddhism especially is known for its emphasis on "nowness." Hindu, Taoist, Jewish, Moslem, Christian, and other teachers urge us to make the most of every day as an opportunity that will not come to us again.
Also under the rubric of being present is the traditional spiritual exercise called practicing the presence of God. This means recognizing that God is here now moving through our everyday activities, no matter how trivial they might seem.
To see more resources about this practice, use the links in the left column on this and the following pages.