Most Recommended:

Big Questions, Worthy Dreams.  Mentoring Young Adults in Their Search for Meaning, Purpose, and Faith.  Sharon Daloz Parks.  Jossey-Bass.  2000.
Offers suggestions for adults to mentor young adults through the critical but often confusing years of young adult-hood.

After the Baby Boomers:  How Twenty-and Thirty-Somethings Are Shaping the Future of American Religion:  Robert Wuthnow.  Princeton University Press.  2007.
How those in their twenties and thirties are influencing American religion today and what the future might look like.

Read the full list on page 2.