Here's Ed Hudgins' piece on
Secular Spirituality. It's pretty basic, but not bad.
"Before we conclude that the quest for a secular spirituality is hopeless, perhaps we should ask: What, exactly, is the true nature of the spiritual or sacred? And do these elevated emotions necessarily conflict with reason, the secular, and the ordinary aspects of everyday life?"
"Because we are human, we create the meaning in our own lives in accordance with our nature and the objective needs for our survival and flourishing. The values and virtues required for life on earth come not from on high but from that nature and those needs. The things most sacred to us as individuals ought to reflect our highest personal values and virtues. When they do, our experience of the spiritual can come from reflections upon the glory of our own creations."
It's an interesting argument, anyway.